I am not sure you will find replacement mounts easy to find, I have just had a look around. I think I found some new ones some years ago for my car, or maybe I am still running some from 1967
. I went out to have a look, but I couldn't see anything down there... Part way through the '68 year, the mounts were upgraded to the ones you probably received.
I think if you look at your old mounts, they are "old style", not failure proof! in other words, when the rubber bonding fails, the engine comes completely loose and can do a major rotation in the engine compartment. The new mounts have a tang that locks the engine into the frame pad even if the bonding fails. In the years before the locking tangs, the horsepower (with
big traction, the killer) builders used to run a chain or cable from the lift side of the motor to the frame to secure the motor in case of bonding failure.
I was lucky enough to find a new set, and maybe there are still some somewhere. The newer ones should fit with some minimal modification, but, you will have to watch that they do not lift the engine if you want to run your Star Wars air cleaner without hood modifications. There is only maybe 3/4" clearance, so any lifting of the engine could be a problem.
If you figure a solve for the problem, please post it here!
'67 Bracket 1380116, pad 1380064
'68 Bracket 1385580, pad 1385582 (3)