Master Brake Cylinder 1941 K7

According to the MT-53D parts manual the MC is listed by chassis number [aka SN].

MC assembly [For K7's only other models listed omitted]
Below Chas. # K7- 32583
48175H IHC
FE-661 Wagner
MC661 Raybestos & Wagner [current industry replacement PN]

Chas. # K7-32583 & up
56509R91 IHC
FE-2652 Wagner
MC2657 Raybestos & Wagner [current industry replacement PN]

For the '49 KB7 the Raybestos catalog lists the MC2657

Rockauto lists both PN's [Raybestos] with reasonable prices.


Link for MT-53D. See section 1205
https://www.box.com/s/otkihx6yoa/2/23417316/251328598/1

Raybestos brakes
http://www.raybestos.com/wps/portal/ray ... zAwMDAwMDA

Just to update this post, I spent the morning going though cross-reference and data books. The 661 has the RCV and is for NON hydro Vac and the 2657 (which is the current number) does not, so it is for hydrovac equipped trucks.
Scotts data links no longer work