Wiseco 3.840inch 1/16 x 1/16 x 3/16inch Single Set Ring Shelf StockWiseco 4 stroke piston ring sets are made specifically to Wiseco's specifications to provide ultimate performance and sealing with Wiseco's wide variety of 4 stroke pistons. From compression and sealing to oil control, rings can make or break piston performance, which is why Wiseco rings are developed and tested for race ready performance. This Part Fits: Year Make Model Submodel 1987 Buick Regal GNX 1984 1987 Buick Regal Grand National 1987 Buick