When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
my understanding is that the parts (and system) are the same on the 997.2 (GT3) and the 991 GTS. I do not know about the compatibility of the 997 GTS
CL system.