[935TURBO]

"Maybe contact the original vendor and see if they carry both, possibly swapped by accident."

Unfortunatly...no...they didn't make any mistake....and they didn't understand why it doesn't work....probably 930/1988 rear arms are different...?....
At the begining I did that upgrade because I found the 930 calipers/discs not enough efficient....and now...rear are not enough because as you probably know, 930's front breaks are often "blocking" when you brake hard....and there's no way to balance front/rear...I tried to limit front....and the results are a bit better...but not as much to have a good front/rear balance....(sorry if my technical language is not completely correct...but I hope you'll understand what I mean...)

Serge