[Benson]

Berts has the A-6600 oil pump rebuild kit.

Bushings, gasket, gear and shaft with gear.

This shaft is turned down to 0.410 from .498 and has been manufactured this way for years that I know of.

Oil pump shafts have always been .498 ... not 9/16ths or 5/8th.

9/16ths is the diameter of the BORE inside the Model A oil pump HOUSING which in April 1928 was increased to 5/8ths BORE size.

So Model A pump housings came in two different versions with respect to the shaft housing BORE. Which means the correct shaft has to be used with each housing.

The 6608 part number appears in the Green Bible.