I've actually got a UR NA PS pulley (if that's what N/A stands for) and it's a 4-rib style too, but the offset trouble I'm describing is with this pulley. It has about the same offset as the OEM PS pulley. If I'm to believe what the UR folks are telling me and all the UD pulleys are the same there's got to be a pretty significant difference in the PS pulley and the one I've got pictured below is not correct. It's just a little hard for me to believe that the "right" PS pulley has at least 1/4" MORE offset to accommodate the offset of the UD pulley. It would look a little weird... but hey, if it works...