I have a '87 t4r. It originally had the 6 cylinder and now has the 22-r swapped in. I want to replace the fuel filter and air filter but I'm unsure if I need parts for the original engine or the current one. I would assume the fuel filter would need the original and the air filter needs the one for the current. I'd rather have the correct parts the first time than have to fool with returning a wrong part.