Needing rear end for 1960 valiant!!!

no axle will not swap -- 60-63 valiants had a smaller bearing (early 63's) late 63-72 had the common size & I think 73- up used a larger bearing.
whole axles will be the easiest swap-- surely a fabo member close to you has 1.
check ebay-- i had to give the spare ones I had away tired of looking at them.
Good Luck ,Lawrence