D-clutch (4HP18, 5HP18, 5HP19) - OE is green F-clutch (5HP19) - OE is black E-clutch (4HP14) - OE is black B-clutch (4HP22) - OE is black D-clutch (6HP26, 6HP28) - OE is black
we are using the black version only - the different colours have been used by the transmission manufacturer probably in order not to mix up the o-ring with other o-rings of similar dimensions in their sub-kits. The colour has no influence on the function of the product.