MIC valves

just wondering where i can get the plastic washers that are on the inside of the MIC manual valves...mine are worn and cracked and causing my air to leak...i called MIC but they only sell the rebuild kits and they are like 28 bucks for each valve...and i only need the plastic washers...if someone could help me out i would really appreciate it email me if you can help DRAGGONU@EARTHLINK.NET thanks

cole