Solid motor mounts

So I was going through a box of parts I have last night, and I found a pair of solid steel motor mounts. Not the brackets that bolt to the motor, but the mounts that would normally be rubber sandwiched between 2 steel plates with the offset studs. Does anyone use those? Should I put them up for sale or toss em in the dumpster? Just wondering. Thanks

They look an awful lot like these: Moroso Solid Steel Motor Mounts