After the holidays, even the e34 is having problems with belt size. A while back I ordered a serpentine alternator belt for the 525 (build date 10/90). Its a 1560 length. However, the belt I removed from the car is a 1555.
I was told by Patrick that they shipped the correct belt size and would like confirmation that I had the wrong one on there. Realoem does show a 1560 applicable for my vintage of e34.
Sorry about the image size, I'm late for work,
Dave M