I want to buy piston for compressors. Let me give you the diameter . 66.68mm--70mm--75mm --76mm aluminum cored .Please send price. if price if appropriate. Do you manufacture rings.. RİNGS.PRİCE -DİAMETER 66.68mm thickness 2x2x2x2x4mm --DİAMETER 70mm3x3x4mmDİAMETER 75mm 3x3x5mmDİAMETER 76mm thickness 3x3x5mm please send the price.