GM China Buick SPS access / wiring diagram

Hello,

I am looking for some way to get the access to china Buick vehicles. Mainly for the software and the wiring diagram.

I am looking for the body control module software from the following VIN:

LSGBC6356GG205239
LSGBC6353GG203495
LSGBC6354JG090051

and the wiring diagram of the WZI transmission rpo 

Furthermore, is there a website that can get RPO list from the GM china VIN number?

Thanks a lot

James