Assuming you want to restore a ECO 90 series air meter, we have the larges Ebay Stores, offering all the parts yuou might need to restore an ECO.
If you don't have an ECO, we also offer complete units (meaning that all the parts are supplied, mechanism working, all new screws, new light unit, new hose and chuck, new chrome, new reset handle (hope I don't forget anything), everything you need to restore the ECO. You just paint the unit and resemble it, you will only need a screw driver and a wire crimper to complete the job. We also offer these painted any combination of color you want. Just let us know what you are looking for, and we will work it out with you. We have been restoring ECOs for over 20 years now.
Jack Sim
Author, Gas Pump Identification book

Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available