I recently purchased a water pump from ebay with 3/8 inch pulleys. The manufacturer was GMB, part number was 130-9710. I have also purchased from Jim Carter Truck Parts. Both vendors specified pulley size.


1954 Chevy 1300 engine 235 (1959)
1955 (first series) Chevy 3100 engine 261 (1957)
1927 (other brand) Model T- engine 327 (1968)