Our Warrior came with only the 2 front seat lower sidewall vents. Most of the time the air flow was sufficient. But these hot Texas summers were taking a toll. Piper included the tubes for the rear seat vents in the wing but no vents. This year I purchased 2 vent assemblies and covers from Texas Air Salvage in Lancaster, TX. From their stock it appears all the sidewall vents are the same. Just make sure you get a right and a left. I installed while I had the sidewalls out. The tube in the wing is terminated by a round plate with 4 screws. I removed this plate and the yellow plastic cap that plugs the tube. The vent assemblies mount with the 4 screws. I aligned the sidewalls over the new vents, marked and cut holes. Reinstalled the sidewalls and the new covers. Now we have twice the air flow and the Texas heat is tolerable.