We are looking for spare parts for compressor's head, exactly - piston rings set. One set of spare parts for repairing of the compressor's head includes 3 rings, each one with specific parameters: 1) first: external ring diameter =88.10 , width = 3.27 (2.90), height = 3.5 2) second: external ring diameter =88.20 , width = 3.05, height = 3.45 3) third: external ring diameter =87.80 , width = 2.40, height = 4 all the parameters are given in mm.