These couplers are for C6 and C7 fitment, but please note that they are application specific. The C6 ZR1 and C7 (M7/A8) version is different from the non ZR1 C6. These are made in house from 6061-T6 aluminum. Please note you may experience increased driveline vibration as is the case with any solid coupler.
These are sold in pairs, and the price is per pair.