I am looking for a replacement (12 bolt/3.73 posi) rear end for my '67 Chevelle convertible and have heard there were two different lengths designed for it. A 53 1/2" and a 54 1/2? Can someone answer this question?

The wider rears are actually '68 thru '72 but will work under a '67 with a slightly greater offset wheel.

Thanks for the info! I need the wider one for my 5" back space wheels.