Speedometer cable length?

I hate buying stuff twice. Thanks guys. I guess I'll have a spare for a while.

Went looking. Rock Auto and Napa showed only cut-to-length universal kits. So I went looking for a part number to cross for a specific fit.

Eureka! The magic answer is 63" for an A-body with a 904 and no Auto Pilot. After 4/7/72 it was shortened to 62". Even Mopar sold a universal kit of 80" trim to fit. Source: 1972 Mopar Parts Manual.