The chassis code for the 2005-09 Chevrolet Uplander, Pontiac Montana SV6, 2005-07 Buick Terraza, 2005-07 Saturn Relay, and the 2006-10 Buick GL8 is [GMT201]

https://en.wikipedia.org/wiki/GM_U_platform#3rd_Generation

The chassis code for the 2001-05 Pontiac Aztek and 2002-07 Buick Rendezvous is [GMT250]

https://en.wikipedia.org/wiki/GM_GMT_platform

Likewise, the Chevrolet Traverse, Buick Enclave, Saturn Outlook, and GMC Acadia's internal code is [GMT960]