67 68 69 70 Factory Front 10 inch drum with left hand studs
I took what I have apart & they measure 10", but someone replaced the studs a one time because they are RH threads & drum from left side is kind of messed up. The one on the right side looks much better but again it has the RH threads as it should. You could install LH treaded studs on that drum if you want. These are the pics. You can decide what you want to do.