damn that sucks 
 
 
i bought a new set of nos motor mounts about a year back on ebay. there still in the box waiting for the rebuild. 
the one good thing about the mounts is they can only move a couple inches even if the rubber is gone, you'll still have somewhat a mount left to hold the motor down. one good design. 
they gave you enough room for the motor to move and scrape?
have you found a set yet ? they might be a little hard to find. i'm sure it's probably been discontinued 

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1980 luv sport 4x4 Just a memory now 
 
Frame rusted from the inside. Truck stripped and now looking for a new donor in southern ohio