Two things...make sure they sent you the right tranny mount. More than one online company lists an incorrect mount for the 1993+ 940's. Second, if you bought after market, check it every oil change. To say the quality of the rubber is all over the board is an understatement.

Related but not in the same thread, check both motor mount but especially the passenger side. If the tranny mount was that far gone, likely the passenger mount is toast now as well. On top of the fact that I tend to replace it twice for every tranny mount in normal operation it has been taking abnormal twisting stresses for a while from the failed third mount.