HAVE 2 EACH-------- DSU31-4.37-37----- DSU31-4.37-50------ DSU31-4.37-56 THEY ARE SAME SEAL EXCEPT THICKNESS _37_- IS 3/8 -_ 50 IS 1/2--__56 IS 9/16 SELLING ALL FOR ONE THIS IS GREAT PRICE LIST FOR .80 EACH SEALS CAN BE USED IN PISTON OR ROD APPLICATION that is 2.80 worth of seals 4 3/8 X 5 ------ I SEE A LOT OF THESE ON FORK TRUCKS ------SEALS LIST FOR .80 EA SELLING FOR $ 5.00 EACH ------------this is below cost --------------hard to get any lower 2.80 worth of seals for .00