Andy is almost right. The red seals are the red seals--but...the sorry black units Fel Pro has sourced from who knows where are JUNK--The old orange side seals are a PIA and not the right diminsions--the blues are a "corrected" version of the orange and the best deal going--The seal that Mopar sells now is the sorry no good POS that FelPro has and it is NOT right--it has caused more problems than you can imagine