I currently have a 1974 Nova posi axle (perfect size) and decided not to convert the front kneeaction front end on my 38 Chevy master deluxe meaning I would need 6 lug rear conversion. The shaft is easy but I can't seem to find any drums that will bolt up. Is there a particular year of 12 bolt rear drums that will? Or do I need to start over with another axle that would need to be shortened? Thanks!!!