I have a Telefix fork brace on my '77 550 K. Apparently the specs for BMW and Honda are the same..as mine said BMW on the bottom too (but I removed it).
Also..looking through a Telefix fitment chart..the specs are the same for the two.
I'm not certain if the specs for a 750 and 550 fork are the same (think I heard somewhere that they were..but don't quote me on that). You could compare measurements to find out. I believe that the specs are different for pre-'77 and '77-'78 though.
You can also contact Gary @ Spec 2..who still sells these braces..as he may be able to explain further (818) 837-1313
www.specII.com .
You should be able to get this figured out pretty easily..if you just follow up a little..
Cheers,
Al / Ichi