Hi all, I just ordered an M5 but couldn't have the pwr. sunshade option with the all leather interior. A mechanic at my dealer said it was possible to retrofit it, but given the trouble they've had with them breaking it would not be worth the $2000(aprox.)to have it done. Latter the shop formeman said they work fine in general(the problems he knew about were misuse(kids, etc.) I have the well-used option in my 540/6 and have never had a problem with it(I'll sure miss it). I wonder if anyone has tried to retrofit one in their E39-M5? Any tales of constant failures? Half the battle would be the existance of pre-wiring for it.