Autolite 4100 suits all 4100 [see carb numbers here] [except 1957 Ford] Motorcraft PREMIUM rebuild kit includes floats [900.AK438P]

Autolite 4100  Overhaul Kit    P/N 900.AK438

As used in:

Ford - all 4100 carburetors with the exception of the 1957 Ford (early design).
The difference is easy to figure out. The accelerator pump diaphragms are different shape 

Kit includes: 

• Pair of new Brass Floats
• Primary Pump Diaphragm
• Accelerator pump plunger pin
• Secondary Diaphragm
• Secondary Diaphragm Lever
• Pair of Needles & Seats – Viton Tip
• Needle & Seat Clips (clips float to needle for better action)
• 2 Idle Mixture Screws and 2 Springs
• Float Bowl Gasket
• Power Valve plus Gaskets
• Flange Gasket
• Venturi Gaskets
• Thermostat Housing Gasket
• Thermostat Cover Gasket
• Idle Compensator Gasket
• Secondary Diaphragm Cover Gasket
• Small Parts & Clips

Carburetor numbers:
5751679 5751680 5751681 5751682 5751683 5752308 5752309 5752425 B8A-A B8A-E B8A-V B8A-W B9A-E B9MF-A B9MF-B
C0AE-J C0AE-K C1AE-AG C1AE-AH C1AE-AK C1AE-AL C2AE-AG C2AE-AJ C2AE-AK C2AE-AL C2AE-AN C2AE-AR C2AE-AT
C2AE-AU C2AE-AV C2AE-AY C2AE-AZ C2AE-BA C2AF-A C2AF-AJ C2AF-AK C2AF-AL C2AF-AM C2AF-AN C2AF-AR C2AF-N
C2AF-S C2AF-T C2AF-U C2AF-Y C2AF-Z C2AZ-G C2SE-C C2SF-A C2SF-B C2SF-C C3AF-AD C3AF-AT C3AF-AU C3AF-AV
C3AF-AY C3AF-BU C3AF-BV C3AF-BY C3AF-BZ C3AF-N C3AF-R C3AF-S C3AF-T C3OF-AB C3OF-AJ C3SF-B C4AF-AV
C4AF-AY C4AF-AZ C4AF-BA C4AF-BB C4AF-BC C4AF-BJ C4AF-BL C4AF-BM C4AF-BN C4AF-BS C4AF-BT C4AF-CG
C4AF-CJ C4AF-CK C4AF-CL C4AF-CM C4AF-DF C4AF-DG C4AF-DH C4AF-DJ C4AF-DK C4AF-DL C4AF-DU C4AF-DV
C4AF-DY C4AF-DZ C4AF-EA C4AF-EF C4AF-EH C4AF-F C4AF-K C4AF-N C4AF-R C4GF-AA C4GF-AB C4GF-AE C4GF-AF
C4GF-AZ C4GF-BA C4GF-E C4GF-F C4GF-Y C4GY-A C4GY-B C4OF-AL C4OF-AT C4OF-BT C4OF-BU C4SF-A C4SF-B
C4SF-D C4SF-E C4SF-F C4SF-G C4ZF-C C4ZF-D C4ZF-G C4ZF-H C5AF-AA C5AF-AC C5AF-AD C5AF-AE C5AF-AK
C5AF-AL C5AF-AN C5AF-AR C5AF-AS C5AF-AT C5AF-AU C5AF-AV C5AF-AZ C5AF-BA C5AF-E C5AF-F C5AF-H C5AF-J
C5AF-K C5AF-Z C5AZ-AU C5AZ-AY C5OF-J C5OF-K C5OF-L C5OF-M C5OF-T C5OF-U C5SF-A C5SF-B C5ZF-C C5ZF-D
C5ZF-E C5ZF-F C5ZF-J C5ZF-K C5ZF-L C5ZF-M C6AF-AB C6AF-AC C6AF-AD C6AF-AE C6AF-AF C6AF-AG C6AF-AJ C6AF-E
C6AF-F C6AF-G C6AF-H C6AF-J C6AF-K C6AF-L C6MF-B C6MF-BE C6MF-C C6MF-E C6MF-F C6MY-B C6MY-C C6MY-E
C6MY-F C6OF-D C6OF-E C6OF-H C6OF-J C6PF-H C6PF-M C6SF-A C6SF-B C6SF-C C6ZF-A C6ZF-B C6ZF-C C6ZF-D
C6ZF-E C6ZF-F C7AF-AL C7AF-AM C7AF-AN C7AF-AR C7ZF-B C7ZF-C C8AF-AE C8AF-BG C8ZF-J C8ZF-K EDC-C
EDC-D EDT-B EDT-C EFA9-AA EFA9-AB EFA9-AC EFA9-BB EFA9-BC EFAO-AA EFAO-AB EFAO-AC EFAO-BA
EFAO-BB EFAO-BC LSA1-SA LSA1-TA LSA1-TB LSA1-WA LSA1-XA LSA1-XB PB8M-J PB8M-K PB9M-D EDT-8B B8A-E EDC-D

This kit has a number 46 diaphragm.
Ford 1957 has a number 59 diaphragm