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Discussion Starter #1
These calipers are for the 328x20 mm Rotor.

BMW Part Numbers
Caliper Left: 34 11 2 226 873
Caliper Right: 34 11 2 226 874
Carrier Part: 34 11 2 226 875
 

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1994 525it 1986 325es
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those are part numbers for the fronts , sorry not rears... also listed for 3.8 e34 M5. Most of the Nürburgring items have to do with suspension.. I have a rear sway bar I
ordered for my e34 Wagon
 

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Rod, the correct part numbers for 328x20mm calipers are:

Caliper Left: 34 21 2 227 873 (still available new: Rear Brake Caliper - Left)
Caliper Right: 34 21 2 227 874 (also available new: Rear Brake Caliper - Right)
Caliper Carrier: 34 21 2 227 875, same part for both sides (these have been NLA for some time)

We considered building replicas of the carrier, but decided to investigate fitting E46 M3 rear calipers + rotors since they are super cheap, easily found, and offer either 42 or 48mm pistons compared to the 40mm piston for the M5 calipers in question. We'll know more about what this entails this summer (2020).

Rob is correct: though the N'ring package is conflated with the big brakes, they were unrelated. All M5s received the big brakes in May of 1994 (production), at which point the Nurburgring package was actually discontinued - because all of its inclusions (minus Servotronic) were standard on the May '94 update. That is also the cutover for the 6 speed Getrag Type D, so these larger brake are more accurately called "E34 M5 6 speed brakes".

Hope that helps!
 

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34-21-2-227-873, shows 1 in Germany.. 34-21-2-227-874 is now showing NLA along with 875 carriers.. once that 873 sells I'm sure it will be NLA from BMW...
 

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Discussion Starter #5
Rod, the correct part numbers for 328x20mm calipers are:

Caliper Left: 34 21 2 227 873 (still available new: Rear Brake Caliper - Left)
Caliper Right: 34 21 2 227 874 (also available new: Rear Brake Caliper - Right)
Caliper Carrier: 34 21 2 227 875, same part for both sides (these have been NLA for some time)

We considered building replicas of the carrier, but decided to investigate fitting E46 M3 rear calipers + rotors since they are super cheap, easily found, and offer either 42 or 48mm pistons compared to the 40mm piston for the M5 calipers in question. We'll know more about what this entails this summer (2020).

Rob is correct: though the N'ring package is conflated with the big brakes, they were unrelated. All M5s received the big brakes in May of 1994 (production), at which point the Nurburgring package was actually discontinued - because all of its inclusions (minus Servotronic) were standard on the May '94 update. That is also the cutover for the 6 speed Getrag Type D, so these larger brake are more accurately called "E34 M5 6 speed brakes".

Hope that helps!
Thanks for correcting my post.
Must have been a mindless late night copy & paste

As for the E46 calipers: the M3 brake line enters the caliper in a difficult angle and the carrier will not accommodate the ABS sensor under the E34 carrier. Re-drilling the brake line entry and plugging the original is possible if you can drill and tap the brake line threads.
The calipers that may more useful are the E39-M5 that has a rear entry brake line and also has the 42mm piston but you still have the carrier/ABS sensor issue.
I have been going through all the possible BMW OE upgrade combinations for the M5 & 850 rear brakes and the carrier for the M5 is the obstacle.
There are also some great rear rotors 328x20mm with 185mm parking brake. I have a simple fix for upgrading to the 185mm parking brake for cars with the 180mm brake.
More to come...
 

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Thanks for correcting my post.
Must have been a mindless late night copy & paste

As for the E46 calipers: the M3 brake line enters the caliper in a difficult angle and the carrier will not accommodate the ABS sensor under the E34 carrier. Re-drilling the brake line entry and plugging the original is possible if you can drill and tap the brake line threads.
The calipers that may more useful are the E39-M5 that has a rear entry brake line and also has the 42mm piston but you still have the carrier/ABS sensor issue.
I have been going through all the possible BMW OE upgrade combinations for the M5 & 850 rear brakes and the carrier for the M5 is the obstacle.
There are also some great rear rotors 328x20mm with 185mm parking brake. I have a simple fix for upgrading to the 185mm parking brake for cars with the 180mm brake.
More to come...
Why not use the stock caliper and put only the carrier from a euro '95 brakes?
rotors i know the e38 328mm or m3 e46 is the one fits?
 

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Thanks for correcting my post.
Must have been a mindless late night copy & paste

As for the E46 calipers: the M3 brake line enters the caliper in a difficult angle and the carrier will not accommodate the ABS sensor under the E34 carrier. Re-drilling the brake line entry and plugging the original is possible if you can drill and tap the brake line threads.
The calipers that may more useful are the E39-M5 that has a rear entry brake line and also has the 42mm piston but you still have the carrier/ABS sensor issue.
I have been going through all the possible BMW OE upgrade combinations for the M5 & 850 rear brakes and the carrier for the M5 is the obstacle.
There are also some great rear rotors 328x20mm with 185mm parking brake. I have a simple fix for upgrading to the 185mm parking brake for cars with the 180mm brake.
More to come...
Rod, that is very helpful, thank you. We have yet to test but will also report our findings publicly to help folks continue crowdsourcing upgrade ideas. Cheers.
 
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