In 1973, the pin caliper's fluid port location changed.

Hose routing is funky when this caliper is mounted toward the front on muscle era Mopar A,B, and E bodies. When this caliper is mounted toward the rear, the brake hose banjo bolt hits the lower control arm before full lock!

'70-'72 pin calipers are fairly scarce and costly. These fit nicely when mounted toward the front, but hose routing suffers when installed toward the rear.

Due to clearance purposes, most pre '73 A-bodies equipped with sway bars and pre '70 B-bodies equipped with sway bars require rear mounted calipers.