Did you make the idler the same diameter as the original so you could use the factory belt or just measure and fit another belt? Chrysler is 7 groove and most everybody else 6 groove. I want to use 7.
Personally I would make the replacement pulley/idler the same size as the original pump pulley so you can get replacement belts easier.
That's just the way I think though, because I want things to be reliable and easy to deal with later if/when needed.
Would it be reasonable to use the pulley off the pump and mount it as an idler?