We (European Auto Clinic, Macon, Ga.) did one of these back in the late 80's. We took a 86 528e and totaled 86-87 M6 ot make the conversion. Great car to drive. That car is the reason for my M5 today!
Daniel it was a pleasure for us to provide you with the modifications you requested for your lovely example E28. It was personally rewarding to work on this project with you and hope we can continue to build our relationship into a long term one.
Best Regards
Andrew
Toys R' Us- Thats the standard spoiler setup for the M535i E28 in Australia.