Piston Rings for the Opel 1.9L engine, sold as a set of four (4). One set fits one engine (4 pistons). Select your size from available sets: STANDARD 93mm, +0.020" (.50mm) oversize, +0.030" (.75mm) oversize or +0.040" (1.0mm) oversize. Top 2mm, Second 2mm, Oil 5mm (Note: See part #6140 for rings for engines equipped with 2.0L size pistons).