BBP disc conversion on an early A

Many posts on the BBP conversion, and some on using F,M,J spindles. One guy even puts that in his tagline "don't believe the *** that you can't use F,M,J spindles". I recall an article from maybe Rick Ehrenberg on using those spindles. I kind of recall that you can't use an M UCA, so must get one from a 73+ A or a special bushing that adapts the ball joint stud on your SBP UCA for the M spindle. Note that one package of the Moog offset bushings is only 2 bushings, so good for one UCA or you can use just 1 on each UCA (as I did). Also, read posts here on how to install them, which is opposite from the directions in the package, which was for a different problem (side frame bent in from accident). You want to move the fwd side of the UCA as far out as possible and the aft side in, which will move the upper ball joint aft to get more caster for radial tires.