Well that should be easy, those are exactly what we're talking about. 10" drums, 5x4" pattern, should be large ball joint.
All you have to do is clean up the upper ball joint and measure it across the flats, should be ~1.9". The ball joint stud at the top of the taper should be ~.724". And measure the bolt pattern, should be 5x4".
View attachment 1715922972
This is going to confuse things. Those are B/E-body drums, large bolt pattern, large upper ball joint.
A-body 73+ 10" drums were
small bolt pattern, 5x4", with large upper ball joints.
