Always amazes me when part numbers are listed that some apply to Canadian trucks and some are completely different. Canadian parts manuals are broken into two manuals: 1948-1950 truck parts list (WM-4252) DE and DF Series (these are the Dodge's in Canada) and FM and FN (these are the Fargo's in Canada). 1951-1953 truck parts list (WM-4294) DG-DH series and FO-FP series. Technically, we didn't have any trucks called the "B" series in Canada.
With reference to Mr Neals post above on radiator caps and radiator cores from the Canadian parts books:
Radiator cap 776379 fits all models listed in the 1948-1950 parts list.
Radiator cap 1243326 fits all models listed in the 1951-1953 parts list.
There are three radiator cores listed for 1948-1950 trucks and four listed for 1951-1953
Radiator core 1195518 fits DE-1, FM-1, DF-1, FN-1 (1948-1950 1/2 tons only)
Radiator core 1195305 fits DE/FM-2, 3, 4, 5, DF/FN-2, 3, 4, 5 (1948-1950 1 tons -some 3 tons)
Radiator core 1195307 fits DE-6, FM-6, DF-6, FN-6 (1948-1950 some 3 tons only)
Radiator core 1273691 fits DG-1, FO-1, DH-1, FP-1 (1951-1953 1/2 tons only)
Radiator core 1273692 fits DG/FO-2, 3, 4, DH-2, FP-2 (DG/FO 1 tons -2tons & DH/FP 1 tons only)
Radiator core 1272883 fits DG/FO-5, 6, DH/FP-4, 5 (DG/FO 3 tons & DH/FP 2-some 3 tons)
Radiator core 1390847 fits DH/FP-6, 7 (some 3 tons & 3-1/2 tons)
No 3/4 ton trucks are listed in the parts books in Canada in this era, although my owners manual (WM-4226) lists an FN-2 as a 3/4-1 ton.
A few part number changes are referenced in a 1954 Chryco Parts Buyers Guide (WM4316) as below:
1948-1950 1/2 tons only use radiator core 1272126 and cap 1243326
1948-1950 1 tons only use radiator core 1272128 and cap 1243326
There are also a few part number changes (mostly obsolete) referenced in a July 1, 1965 Chryco, Cancelled, Obsolete and Superseded Parts list (WM4698) as below:
Radiator core 1195518 use 1243326 (cap) & 1272126 (core)
Radiator core 1195305 obs sp (obsolete)
Radiator core 1273691 obs sp
Radiator core 1390847 obs sp
Radiator core 1272126 obs sp
I have a 1950 Fargo FN-2 (1 ton), my buddy has a 1950 Fargo FN-1 (1/2 ton ) and we have a 1950 Dodge DF-1 parts truck and there seems to be some differences between them all in certain areas. Probably depends on when built and of course what previous owners have retrofitted. My truck actually has the 1195305 radiator still in it!
Tim