Hi Howard, I'm glad to assist you. RL is the premium top-of-the-line model type and TL is the basic model trim package. RL is AWD and TL is FWD. The RL has 300 Horsepower and the TL has only 280 Horsepower. The RL has 24 MPG and the TL has 29 MPG on the highway. If you have the RL, grab our sale price offer and click the first link below to order this part today. But, if you have the TL, click the 2nd link below to order the matching part. I hope this helps. Happy shopping. https://www.carparts.com/window-regulator/replacement/a462902?can=CPJE1043_20220417 (RL model) https://www.carparts.com/details/Acura/TL/Replacement/Window_Regulator/2001/Base/6_Cyl_3-dot-2L/REPA462938.html?can=CPJE1043_20220417 (TL model)