rear leaf springs

[sg66]

For reference, here are the VCM springs

Those pictures reminded me, 42-437 number is the industry replacement number for 1967 cars, see page 33 http://springresearch.org/pdf/volume_17.pdf (you can change the volume in url to 16 for earlier cars)

When I did mine, I spoke with the supplier who told me they were rated for 1967 cars which were a little heavier than 65 and 66. Rather than stock specific springs for each year and model, they took the one size fits all approach. I had mine de-arched about 3/4" after letting them settle for a year which put the free arch right on the money for 65/66