CSF Universal Single-Pass Oil Cooler / RSR Porsche / M22 x 1.5 / 22L x 4.75H x 2.16WCSF offers the best and most advanced Oil Coolers on the market. So when it comes to keeping your engine oil temps down as you push your Universal 73' Porsche 911 RSR Style Bumper hard on the street or track, a CSF is the obvious choice. Single Pass Oil Cooler Overall: 22" L x 4. 75" H x 2. 25" W Core Surface: 18. 9" L x 4. 72" H x 2. 25" W Direct Fit for Porsche '73 RSR Style Front Bumper High Efficiency & Rugged Durability Bar Plate Design M22 x 1.