I am having troubles trying to find the heater core for my car and so is the auto parts department. I have an 88 cutlass supreme with a 5.0 engine its a rear wheel drive and it has ac. im not sure if its hard to find because its an 88 and that was the last year of the rear wheel drive option but i would appreciate some help in finding the right one. would i have to pull mine out to find a part number?