I went into RA to look around, just now (Friday AM). Gabriel and a few Monroe listings. Their listings indicate 1955-1964 coverage, front and rear. No gaps. In these "buyers guide" listings, you have to also understand that some models did not go all the way through that time frame. Some models end in 1960 or others start in 1962, for example. So you have to look at the model names (as "New Yorker") that were built throughout that complete period. In some cases, the same shock also went back to the 1951 model year, but the complete upper end "stop" was for 1964 models.
What this means is that the mountings were all the same, with the compressed and extended lengths being compatible, too. Things which ANY shock manufacturer would be consistent on, even if they might provide an "adapter kit" in the box with the shock.
Now, why does KYB have "a gap" in their coverage? Might even be as simple as "an over-sight" they made, not knowing that? Which is why I looked in the Gabriel and Monroe listings at RA. As confirmation of the similarity and compatibility of THEIR shocks on the car.
Perhaps a respectful call or email to KYB (by a motivated buyer) might provide their answer? If they build a shock for a '58-'60, not '61, but '62, as everybody else has shocks that use one shock to cover those model years, did they overlook something? Just curious.
CBODY67