Corbeau seats are weak IMO, feels like sitting on springs.
SPARCO SEAT BASE PART NUMBER!!!
5001020F - DRIVERS
5001021F - PASSENGERS $79.00 each
Depending what seat you are installing you will either need to use the side mounts (00490NR) or the slider tracks (00493)
I can get you the seat bases if you like, would be 2-3 weeks for delivery.
Do you have seats already? Prodrive seats ftw if you are a smaller guy like me.. 5'10" 30" waist 145-155lbs.