I haven't been on the board in a while. I got married had a kid and life just went crazy, also now expecting a second kid.

I knew when my Vibe started having issues I could come back here and get solid advice.
My beloved Salsa Red 2005 Vibe's tranny is slipping and I want to get another but I am unsure if the specs for this one on ebay fit my car.
How do I find out if my 2005 Pontiac Vibe fits the bill? - VIBE 05-06 A.T.; (1.8L, VIN 8, 8th digit), FWD (opt MU4)
I know mine is 1.8L Automatic FWD, but I am notsure of the VIN8, 8th digit and opt MU4.
I just have a base vibe not a GT with the FWD. Is there something I can look up in the car?