What mounts are these?
Those are definitely 66-72 BCE bodies BB
To correct any confusion they will fit any 66-67 B and C body SB or BB V8 k member or subframe. Non hemi of course.
The drivers side has the tube welded in. It takes a long bolt there.
I can’t really PROVE IT (like Powerflite Wants) But I’ve been around for many decades and that’s like doing an ID on a Qtip. Very common part. But yes they have value with all the motorhome 440 swaps you need these mounts.