Here we have a pair of pistons.  They are dirty from storage , but look unused.  One is marked Delco 5459320 & the other dos not have any markings. The box is marked   GM  5467738 , which fits a 1960-1974 Chevy GMC Truck.  The cap inside is old & used & came off of a 57 chevy truck.   You be the judge on fitment.