I learned by trolling the salvage yards that many of the early slants ( prior to smog pumps ) used an idler pulley similar to this one used here when vehicle was equipped with A.C.
There was also an idler pulley used on the mid eighties ( at least ) slant trucks but I cannot remember the reason or particular combination of accessories that would have called for it.
I found one of these mid eighties trucks with this pulley, took it my local Napa and they matched it. 12 bucks maybe. Not worth running an old pulley with the original un-serviceable bearing in my opinion.
I then fabricated the spacer you see behind it. Nothing very high tech but it works like a charm, use the slot in the smog pump bracket for adjustment.
I still plan on getting around to doing something with the bracket to make it more appealing to look at but havent made it that far.
Let me know if you need measurements or better pictures.
