Keystone aftermarket car parts is a subsidiary of LKQ Corporation, which specializes in dealing with cheap automotive parts. Keystone offers several different lines of aftermarket parts and the lowest tier offers the best value while the highest, although more expensive, offers the best quality.
Value line parts are the cheapest components available from Keystone. They carry a warranty, but are not certified through any viable third parties. The Goodmark line deals in aftermarket replacement panels.
Platinum Plus lines are the top shelf products offered by Keystone. The parts undergo a rigorous quality control process to ensure each part is up to par with original equipment manufacturer-specific quality.