Early-A steering column
the manual shaft is longer than the power one by ~ 1.5". The manual is more desireable, since more people ditch the power steering for BB or SB conversions. someone will trade you even up for sure.
I had to add a small section (1.5") to my PS shaft for my manual box conversion. Also; the PS box is a larger dia. at the spline (~.75"), the manual is smaller (~.675"). that's why the couplers are different.
I used a later styler coupler, since I was just grafting it onto the shaft anyway.