Cooling fan 1" from shroud
I'm not aware of any spacers, but check around for fan clutches from different engine and body applications. There were a lot of different shaft length variations that should get you in the ballpark.
For instance, your clutch appears to be from a mid -'90s 5.2/5.9 pickup

But a full size pickup with a V6 used one like this:

And early 5.7 hemis used ones like this:

All are reverse rotation and the same thread size.
If it were me, I'd spend an afternoon at the junkyard with a tape measure and check out all the different permutations of Rams, Dakotas/Durangos, and vans with V6, Magnum and Hemi engines. Make note of what you find and go buy a new one.
This would be a good chance to check out available fan diameters, too.