I didn't modify the original bracket so much as I used the original as a pattern to make a modified version to work with an alternator. Not much to it, just added a tab at the approximate thickness of the alternator ear ended. For the top, I made an adjustable mount using Heim joints (1 with RH threads, the other with LH threads) a few nuts (again, 2 RH, 2 LH), and short peice of stainless tube. That not only allows for adjustment, but also for the slight misalignmnet due to where the mounting ear sits in relation to the block.
I'll see if I can get some good pix for you of what I have setup.
