I have a Brand New set of Diamond Pistons for a Buick 455 They are 4.380 they were made for a 4.05 stroke with a 6.800 Connecting Rod. The pin diameter is .990 and the Ring package is 1/16 1/16 and 3/16 The pistons come with a set of Total seal rings, Asking $475 Shipped. See specs below. Attached Files: IMG_3953.JPG IMG_3952.JPG