72 vs 73 Rear Shock Difference??

[dieseldawg142]

don't know about your specific application, but did the shocks on my sister's '85 chev van, parts store wanted $65 per shock. after checking, they were the same as what was on my '68 gmc, back to the parts store-$28 per shock. why? don't know, they matched almost perfectly ('68 had about a half inch more stroke)
you should have no problem using '73-up shocks