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There are three crossmembers. The one piece with the typical mount, the two piece crossmember with the typical mount, then there's a one piece crossmember with the fluid filled mount. The easiest solution for both of the oddball crossmembers is to get the typical one piece crossmember and typical mount.
I have the Energy Suspension POLY ROUND mount (1 box), don't know if 1 or 2 are required. Had it for 20+ years NEVER OPENED. I would hope the 1 box contains both pieces to do 1 crossmember. I will verify tonight.