2000 SSEi Engine/Transmission mount part#'*
I've come into a few extra dollars and decided to replace my old and worn engine and transmission mounts. Since I got some contradicting info about the part numbers, I thought I'd post the final results here in case anyone needs them.
25710672 - Engine Mount (right fenderwell)
25731375 - Engine Mount (front of car) <--this is the one most are replacing with a solid mount
25713700 - Transmission Mount (left fenderwell)
25723646 - Transmission Mount (firewall area)
As expected, GMPD has better prices (incl. shipping) than buying local at the dealer.