CS (all years) 33490-20030
RC (08/1991 - 10/1991) 33490-20040
RC (10/1991 - 02/1992) 33490-20041
I'm not sure how the last two are different :shrug: bet the radiator is the same. The CS is $70 more in my EPC, all of them are expensive, and they come as an assembly (with lines and mounting stuff).