Fuel pump what does it fit

I have an AC fuel pump that I can't figure out what it fits.

It has three numbers on it.

On the housing at the mating surface to the block is number 15231964

On the shaft that hit the cam 21755 with a 3 below that and the final 5 may be an 'S', I can't tell.

On the top at the fuel bowl 856203

Photos are below, Any help would be appreciated. Thanks.

Looking in 1930-1948 AC specification book, the 152xxxx series have only 7 numbers.

Strange number yours having 8.

Bob,

OK I went and looked at it again. The final number "4" probably was stamped later as it is deeper off alignment and incomplete compared to the rest of the numbers.

Which leads to the question why was it stamped?

I think we got it.

1523196 is a "F" series pump. The "4" may mean rebuilt.

Later years- the end number 2 represented rebuilt.

1937 Packard 8 Cyl 1500 series

.

1938 Packard series 1603, 1604, 1605

Thanks Bob, hope to Meet you out at Ames, looking forward to seeing that '54 Landua

Hi ,I was looking for a rebuild kit and entered the numbers found on top of the fuel pump 856203 ,I found your post and the ac pump i have which looks exactly the same is off my recently purchased 1934 Buick Model 67 4 door sedan. Peter

Thanks.