I remeber them on all kinds of trucks growing up, I think our school busses even had them. They're out there if you keep looking, the question is if the mounting kit is with them or not. Really, if you can get ahold of even one bracket you can fabricate others, and the backing plate of the bell has several slots and holes for hubs with markings to fit various numbers of bolts and hub diameters.

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P