dgc333, I believe the 76739 is the small bolt pattern rotor (which is fairly common now)as found on the pre 73 cars. Summit Racing is even carrying those now. The object here was to get the large bolt pattern 4.5" without changing out the spindles, UCA, ball joint, and calipers,etc.. All of these parts have to be found and installed if you used the post 73 stuff. There`s one company www.hotrodsusa.com that has a Wilwood kit for use with pre 73 disc spindles but it`s $800.00. That`s way too much to spend just for a larger bolt pattern. This is a cheaper alternative as well as less work.
