New prothane transmission mount too tall.

So last night I tried to replace my transmission mount on my 68 Barracuda with a new prothane 4-1602 mount that I got from Jeg's. I removed the old mount, and noticed that the new mount was taller than the old one. I figured well maybe the old one is just sqooshed flatter. So I put the new one it and then the problems started. I couldn't get the cross member to bolt back in. In fact I jacked up the transmission until it was hitting the tunnel and there was no way that I was ever going to get it in. So I pulled it back out and put the old one back in. Anyone ever experience this?? Is there another shorter mount out there, is it just the Prothane mount that's too tall?? Any info is appreciated.