Do they fit?

I see thanks for the teaching as always I'm wrong haha. maybe I have not Kelsey Hayes, as I thought that was the name for the bbp discs which is what I have.

I've also looked at wilwoods which could be an option, currently I'm just looking for deals on everything I need to do the bbp swap and when I have it all I will start swapping it on
pretty sure all the A-body Kelsey-Hayes are small, 4" bolt pattern. HERE. if you want to swap out to large bolt pattern get the stock 73' up setup.
start here with a little patience you can do this as cheep as anything else and it will be the easiest to maintain