If your talking about the motor mount that style breaks often. They do now make a poly lock motor mount that isn't suppose to break (but they ain't cheap!) and this is a part of the reason why you see people switch to the spool mount style.
Check your links, they both just go to a basic ebay search. I do know which mounts you're talking about though. I'm afraid to use them, or solid mounts, for fear of breaking the single rear tab on the block.