New parts are often worse than the old one you're replacing. It's all junk from China.

Your best bet is to rebuild your old pump or have it done by a place such as Then and Now Automotive www.then-now.com or The Flying Dutchman

Water pump rebuilder and seller of antique water pumps for all makes and models

Flying Dutchman
Wade Jenezon, 650 Upper River Rd
Gold Hill, OR 97525 USA
1-888-595-1110 Outside the U.S., 1-541-450-2277
http://water-pump-rebuilders.com/

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)