Andrew, Don't know if this helps any but When I replaced my wheel cylinders they came in a raybestos package. The front cylinders had part numbers of WC37014 and WC37015 and the rear were WC37016. I just checked Napaonline.com and they cross reference WC37014 and W50014 to UBP37016. So unless it is mis packaged as someone suggested it should be the correct ones. Good luck. Jamie SMith Spokane, WA oconner51@xxxxxxxxxxx 1966 Rambler American 220 Station Wagon 1966 Rambler Classic 770 Two Door Hardtop 1966 Jeep Wagoneer (For Sale) 1977 GMC Sierra 3/4 ton Pickup 1986 AMC Eagle Station Wagon ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist