disk brake conversion question

[Shmaako]

I suspect an odd question but....I'm having to upgrade the entire front suspension. I was going to upgrade to LBP as well however, I want to wait a couple of years for that to prevent even more cost of rear axle upgrade and rims etc. That being said, I did manage to get a front LBP disk setup complete with UCA's from a junkyard donor car(73 a body), and was wondering if .....
I could find a small bolt pattern rotor to fit on the 73 spindle?
This way I can maintain sbp for a while for my existing rims, and the large ball joint on tubular UCA's will fit the spindles.

 

[hemi71x]

Search ebay.
There is a vendor, that markets a disc brake conversion kit using 73-76 A body brakes, drilling brakes for the small, 4 inch bolt pattern.
But people have been reporting fitment issues with the center hub of the rotor, that don't fit lots of 4 inch bolt pattern wheels.