I dug up the shock absorbers that I pulled off of the '49 1-ton to study them a little more, as they appeared original with the DPCD logo stamped into the dirt shield. I was able to get the p#s off of them and critical dimensions:
F -- 1261982 -- 12.38 -- 20.25
R -- 1196294 -- 11.75 -- 18.75
I could not find neither of these p#s in the parts book nor could I find any reference to them online, so I'm not sure if these were original to the truck or if the p# I'm looking at on the dirt shield is referencing something else...these dims compare very close to the dims of the 31000 & 32207 shocks that I've been using for years from Monroe, which were listed as replacements in their interchange book back in the 90s.
So I did some studying of the parts manual and Monroe's Instruction Guide, as well as Gabriel's Online Catalog (which took some digging to find), and found some more part replacement numbers that could be used. Some shocks are more available than others, and some shocks are cheaper than others, but after putting a few more hours into researching this topic, I think we have more options available for builds and restorations.
One thing I noticed in the parts manual is the specification of 1" domestic and 1-3/8" heavy duty export. Looking at the shocks available, the common spec for passenger cars is 1-3/16" bore, with light truck shocks having a 1-3/8" bore. I switched to a large bore shock on The Blue Bomber years ago, and it produced a slightly bouncy ride unladen but under a heavy load or pulling a trailer, the truck rode nice and smooth, and braking was much more controlled, with noticeably less nose dive. So if you are just going to use your old buggy for commuting, then the 1-3/16" shocks should work fine, as they are a stronger design than the originals...if you plan on carrying a load on a regular basis, then the bigger shocks are a good investment. I know when I was hauling water with both my '48 1/2 ton and '49 1-ton, I noticed after a few years that the replacement shocks (1-3/16" bore) were all leaking as I was really loading up the suspension but not moving in a hurry on any trip nor traveling tens of thousands of miles annually.
B-1-B, -C, -D
B-2-B, -C, -D
Front -- Monroe 31000 = Monroe 59001 = Monroe 32293
Gabriel 81147 = Gabriel 82047
[1-3/8"] -- Monroe 34904 - Monroe 37098 - Monroe 37112
Gabriel 61500 - Gabriel G63689
Rear -- Monroe 32207 = Monroe 59017
Gabriel 81676 - Gabriel 82007
[1-3/8"] -- Monroe 555004
Gabriel 61550 = Gabriel G63949 - Gabriel G63299
B-3-B, -C, -D
B-4-B, -C, -D
Front & Rear [1-3/8"] -- Monroe 66858 - Gabriel 82065
The Monroe and Gabriel shocks are not exactly the same in extended and collapsed dimensions, but they are generally within 1/4" of each other. The best way I can explain this is that the Pilot-House trucks have a certain suspension travel, as do other makes & models that have similar geometry, and the manufacturers make shocks that fall within a certain range within that travel, so several different shocks could possibly fit a certain suspension geometry and still work. I would favor a shock that allows the spring to hit its bumpstop so that the shock is not bearing a severe load...conversely, a shock should still have some stroke left when the springs have reached max vertical travel so that the tires are not being lifted off of the ground prematurely, enabling more control of the vehicle in extreme situations.
Obviously, the B-3 and B-4 shocks that are available now are more limited...just looking at the applications online, that 11/16" mounting diameter does not appear to be an industry standard as the 5/8" and 3/4" mounting diameters have been used on many shock configurations over the years. I would list the different colors that these shocks are coated, but some of the factory descriptions do not match the pictures on their websites...also, some vendors had different colors listed from the factory website, so I reckon ya get what you get in the box