thickness 2,0 mm - Different vehicle manufacturers use different thicknesses of this aluminium seal washer. VW/Audi uses 1,4 mm - BMW/Mini uses 2,0 mm - we normally provide our seal washer with 1,5 mm as used by Mercedes and ZF for Ecomat. We suppose that the thickness has no influence on the function of the seal. A seal with thickness 1,4 mm is not available.