Stop in for a cup of coffee

The "set" are two identical mounts. Pattern same as the right side only... but they're almost an inch thinner than the current mounts.

Single bolt stud through the K, 2 bolt studs to the engine

Current K is not a spool mount
Ok back up.

your K is a 1965?

the engine is a 1981?

Do you know which motor Mount BRACKETS you have?

also, pre-66 mounts were different than later years.

what I would suggest is motor Mount brackets and isolators from the same year as your K, so 1965. The slant 6 block didn’t change so the brackets should interchange.

If you can’t find mounts by the time I get back from California, I’m going to a junkyard the following weekend, I’ll check there