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I could be wrong, but 3 and 5 go with the front or dog-bone mount. Number 4 is passenger side motor mount. 1 and 2 have to be crossmember and transmission mount. Do they not have part #'s on them that you can search?
Now that you mention it, each one does have a little number on it.
1 and 2 are 69126
3 is 69129
4 is 69127 for both pieces
5 is 69128