2wd single to dually

[sonoran591]

last year I built my rig its a 1939 dodge on a 1996 2wd cummins chassis Id like to convert to a dual wheel I can clear the rear drums of the dana 70 with some 19.5 wheels I sourced from the scrap yard. need to space out the front wheels. what spacer am I actually looking for?
obviously wont do much hauling with the setup just purely for the aesthetics

 

[PSUCE]

The factory ones look like this:

Or you could buy something like this if you need a custom offset:

 

[Tate]

If its IFS, then the spacer is integral to the hub/rotor. I'm sure you can use a bolt on one as well from the 4wds and later 2wds.