To install Bearing Buddies, you first need to know the grease cap diameter needed by measuring the inside of your trailer hub diameter at that location. I recommend using a digital caliper like # PTW80157 for a precise measurement.
I've attached an installation video to assist. This Bearing Buddy Bearing Protectors - Model 1980A-SS w/ Auto Check - Stainless Steel (Pair) # BB1980A-SS are a confirmed fit for 1.980 inch hub bore. view full answer...
The Curt # C12333 trailer hitch that fits your 2007 Pontiac G6 actually comes with bolts and a fish wire tool so you do not need to order those separately.
If you just need replacement hardware that is available at part # RHK; on the product page you only need to put in the hitch part number and select Curt in the Manufacturer drop down. view full answer...
The Draw-Tite hitch, part # 36426, will fit your 2008 G6 GXP as long as the body parts are factory parts and not dealer or aftermarket. According to the instructions, you will not have to cut or trim the rear fascia. I have added a link to the instructions below for you to review. view full answer...