They fit mainly between the cooler and the housing. Thickness: 5mm. Compatibilities are a guide only. 80 81 [1972-1987]. 80 89 8A [1986-1991]. 80 8C [1991-1995]. 12 month warranty as standard. Engine Codes: ABB, ADA, BGU, AHL, ALZ, ANA, ARM, BSE, BSF, CCSA, AKL, APF, AUR, AEH, BFQ, CMXA, AFS, AWH, AVU, CHGA.