Spare parts for lamp socket

I am trying for find three lamp sockets for my IH tractor panel lamps. The sockets “snap” into a 5/8-inch hole and have two leads off the socket. I use a No. 57 bayonet base lamp in them. I have found none locally or on the Internet. I have found sockets that would fit but they have only one wire lead. As the control panels are non-metallic, two wire sockets are required. My tractors are of the 1940-50s vintage. Anyone know who might have these?

Frank Kuehl
724 Congress St.
Neenah, WI 54956

Send letters to: Farm Collector, 1503 S.W. 42nd St., Topeka, KS 66609; FAX: (785) 274-4385; e-mail:

Farm Collector Magazine
Farm Collector Magazine
Dedicated to the Preservation of Vintage Farm Equipment