Ok, so here is what the carquest sites says:
A500, A904 Transmission; Lockup; 11" Diameter; 26 Splines; 1.810" Pilot; Slotted Hub; 4 Lug Mount; 10" Bolt Circle; High Stall, "HS Lock Up" Decal; 122 Tooth Ring Gear
Does that description sound right?
Also, the converter is the only part that locks up, regardless of the OD, becuase the OD is in the tail shaft, right? So in my mind it shouldn't matter as long as it fits the A500 and locks up.