As Larry says:

http://www.napaonline.com/MasterPages/NO...echanical+Type)
(Note that the picture is showing it upsidedown)

All 1937-1963 216/235/261 pumps are interchangeable, as far as the motor side of the pump is concerned. The inlet/outlet connections may differ depending on application.
They also sell double acting pumps should you want to improve the vac signal to the wipers.

Last edited by gearhead; 07/01/08 12:19 PM.
I.I. #3174