You are bidding on a CLOSEOUT, NEW, set of two(2) diesel fuel filters for Datsun / Nissan: 1981-85 720 Pick-Up Truck with Diesel engine. These are the primary and secondary filters in shelf worn boxes. A RARE! Find....... Our# 043-0827, 043-0866.
See the Fuel Filters thread for more info.
The primary filter shown is for 1983-on, and the secondary filter is 1982-on. In no case would these be correct filters for 1981 720 SD22, though the primary filter could at least be made to work. I don't think the secondary would even screw on the 1981 filter base, and you'd still have to plug the water sensor hole in the bottom.