Over time all internal engine wear surfaces become worn. This is true for crankshaft journals, connecting rods, camshaft lobes, piston rings, bearings, etc. When rebuilding a worn out engine youll need to replace them all in order to regain the engines original performance. And, lets face it, Jeeps need all the power we can get. Omix offers new high quality replacement engine parts to get your Jeep back on the road. This replacement piston ring set fits 87 - 93 Cherokee XJ, 87 - 93 Wrangler YJ, 87 - 88 J - Series Trucks, 87 - 92 Comanche MJ and 93 Grand Cherokee ZJ models equipped with 4.0 liter engines with 0.010 - in. over - bore. One set does one engine. Replaces OE 83501988K6