I have an idea. If you could give us the 'specs' on those plates when you get them some could make their own when this problem arises. The way I did mine was to bolt a plate to the block on either side. Bolt the mounts to the frame mounts. Sit the engine were I wanted it and then welded the motor mounts to the plates. I didn't get any measurements because I did it this way. Those plates you are buying will have four holes. Two threaded and two bigger. They should be easy enough to make with the hole locations mapped out.