Magnum 500s

Rice Nuker said
No problem! :) I would run same size rim front and rear. Bigger diameter rim = less sidewall = more control.

Those wheels are a lot cheaper than an all aluminum Magum 500 Classic Industries sells in either 15 x8 (http://www.classicindustries.com/mopar/parts/mw803.html) or 18 x 7 (http://www.classicindustries.com/mopar/parts/mw810.html)., I doubt if the wheels in the link you provided needed machining it would be be hundreds of dollars worth per side.

Yea, that makes sense. Just need to figure out what is a good size tire for 15 x 6 that will fit the front of a Duster.