Partner Husqvarna K750 Piston Rings No. 503-28-90-47. This is the true OEM Partner piston rings. Comes with two rings. Partner No. 503-28-90-47, 503 28 90-47, 522-99-01-01, and 522 99 01-01.
Stihl TS410 & TS420 Piston Assembly No. 4238-030-2003. This is a quality aftermarket piston assembly. Includes piston, rings, pin, and cir clips. Replaces Stihl part numbers 42380302003, and 4238 030 2003.