Idler pulley problems

What cover are you running (car/truck)? I just bolted a pulley on a boss of the cover with a spacer on my setup (no A/C or P/S on a truck cover). I can take some pictures if it would help, but if you're running a car cover I'm not sure if you could do the same thing or not.
I'm running a car cover. My 2012 Challenger has electric P.S. and uses this type of idler. The spacer bolts to the driver's side cylinder head (which you probably already know). I could measure it and ask Mopar for specs on the spacer, but they prob. wouldn't have them. :-(