Anybody running 17" Cobra Bullit rims on a Duster

hate to be that guy but...
im looking at the 18x9" fr500 from american muscle for my 69 valiant

im running dr diff axles in an a body housing with the mopar .75in relocation
( seems to me that it only moved in .5 per side ) and dr diff's viper caliper kit with rms uca

so the big question what do i have to do to make them work?