I’ve got a D339 engine with 3 pistons with the part no. 4h9886. These pistons have 4 rings. Does anyone know what engine/ machine these pistons would be out of or the part numbers for the rings for the pistons. The other piston in the machine is a 3 ring one with the part no.  4m9110. The top compression ring on this piston is quite a bit thinner than the one on the 4h9886 pistons. It’s mainly the top ring I’m after and I’ve been told ring 5m5704 could be the right one, but there was no information on the dimensions of it 

if anyone could point me in the right directions that would be great thanks 

For what it is worth, According to Tractorparts.com,, 3H4641 RPB 5M5704. 6H8626 RPB 5M5704. 7F3709 RPB 5M5704.