I installed an SSR light flywheel to my 99 748. I did not use their nuts. Their part and model application can be seen here...
You can view the nuts and spacer at this photobucket site...
I have to tell you that these nuts thread on real tight. It kinda spooked me so, I just re-used the OEM nut and put lots of red locktite on it. My nuts do have a slight bit of superficial surface rust. These nuts have NEVER been installed and have just been sitting in my garage in my pile of "things that need to go on ebay".
$40 delivered to the cont. US. Please use PM as I don't monitor this thread.