For service and parts here are some ‘Grumman‘ shops:
AirModsNW
Telephone: 1-8 PROPELLER Email: Ken
Fletchair
Telephone: 1-800-FAWINGS Email: Parts
Yankee Aviation
Telephone: 1-513-519-7008 Email: Roscoe
Arizona Aviation Service
Telephone: 1-602-697-4125 Email: Rags
Aircraft and Marine Assurance
Telephone: 1-360-694-1303 Email: Norris