Help identifying MCs please

[ArtGeco]

Im working on a 32 ford coupe with dual master cylinders.
Im trying to find rebuild kits, but I can't
make out the part numbers completely. also, it seems that the
bolt holes are an odd spacing (It seems).
Also, I don't see any online with circular extrusion on the sides like these.
They are stamper FoMoCo.

Specs:
Bore Diam 1"
Bore Depth (If I'm measuring correctly?) 4.5"
Horizontal mounting bolt distance center to center 3.75"
Vertical mounting bolt distance center to center 2.375
(There were no pistons in the cylinders)
Part numbers appear to start with AA 21???

 

[Mart]

Can't check dimensions but they look like my 57 Thunderbird brake cylinder. Check Rockauto. Bore is stated as 1". They were probably used across multiple models.

 

[rich b]

Look like the cylinders we took out of some '55 Fords to use for clutch and brake cylinders back in the '60s.

Looked those up on RockAuto and they list for wide range of Ford products from '52-'60,
including the T-birds @Mart mentioned.

Kits are cheap enough as long as the bores are OK. Be sure to leave the residual valve out of the clutch master when assembling.