How' $35 shipped in a flat rate box? If I could find the receipt I'd take it back, I think I paid around $52 for it. Here's some pictures. PM me if you want.
In your pictures on the first post, if the idler arm has 7324 on it and that's the one your looking for I have one new in the box if your interested. MOOG part number on the box is K7086 for 73-76 A body. I bought it to replace mine but didn't use it.
Here is a link to some good tuning advise using a vacuum gauge.
http://www.moparstyle.com/forums/how-technical-instruction-white-papers/9715-tuning-vacuum-guage.html
If that one doesn't work try this one, same guy.
http://www.diamondbackengines.com/technical-white-papers/vacuum-gauges/
Here's an old picture I have saved of what one looks like. I think there all the same you can knock them off with a chisel pretty easy if you find one in a scrap yard somewhere.
Your welcome, might check with some of the junkyards that cater to Mopars. I'm sure one of them will have what your looking for.
http://www.texasacres.com/
http://www.wildcatmopars.com/
http://www.stephensperformance.com/
http://www.tonysparts.com/
You can get the belt line kit from this guy here. http://www.forabodiesonly.com/mopar/showthread.php?t=102532
Not sure about the rest of what your asking, I need to replace the glass in mine too.