wheel cylinders for a 35 Plymouth

[DixIndian]

I am scrounging brakes for my 35 Ply speedster. I found that the front can use the stepped cylinders  1.25" /1.375" sleeves. Also found the smaller sleeve goes forward.
have not found what size the rear cylinder size needs to be. I have several 1.25 " and 1 nice pair of 1.128" cylinders. these are not stepped cylinders.
anyone know the rear cylinder size?
Thank you
Richard