Matt
It looks like it is/was specially made. Obviously they are made becuase there are new brackets with studs at Mancini, Year One, etc. I even looked at 1/2" studs and did not get a lot of hits. It seems like everything was either less than a 1/4" or bigger than 5/8". Oh well. Thanks for looking. I will get the studs from Rusty CUDA for now. Then, if I really want to change, I can go with the adjustable Mancini ones. Thanks for all the help.
Chad