The early seat riser for the early CCPU is different than the seat riser for the late CCPU with the Budd body with the steel roof. When ordering a seat riser or when ordering the seat springs, you have to have the right ones for your cab type. On my late '31 CCPU Budd cab, I got them mixed up and my new seat spring sat so high that I couldn't see out of the windshield. I had to shorten up the seat springs 2" so that I could see out.