There are several 3 bike trunk mount bike racks that will fit a 2005 Buick Terraza.
From Yakima, you can use the following:
KingJoe 3, # Y02620 (instructions linked)
KingJoe Pro 3, # Y02625
QuickBack 3, # Y02622 (instructions linked)
From Thule you have several more options:
Archway 3, # TH9010
Gateway 3, # TH9007 (video linked)
Passage 3, # TH911XT (instructions linked)
Raceway 3, # TH9002
Out of all of these racks, I recommend the Raceway 3 for several reasons. First, it is a very... view full answer...
I spoke with my contact at TowReady and he said that the installation process for the TowReady wiring harness # 118396 is the same on the 2005 and the 2006 Buick Terraza. I have included an installation video of this part on a 2005 Buick Terraza for you to check out. view full answer...