Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I've mentioned this before and I still don't understand the physics.Surely your tyre is going to break loose long before enough stress is put on those bolts.
The next question is what 750?. Most of the 750K had a caliper that bolted from the back, until the K8 which had a front bolted caliper. The K8 shared the same caliper as the 750 F1. The 750 F2 had a totally different set up, shared with the 750KZ and KB. I have never seen this arm with the 50mm space on any 750's. There must be someone who has this 50mm/wide body caliper fitted. Come on now, don't be shy.