Since all vipers have six lug wheels, I think the OP was referring to the viper style of wheel and should have said as much, because no viper (all gens) have 5x5.5 bolt pattern. That size is probably from the truck.
All Viper's since the dawn of Viper Time have been six-lug. Type SRT10 wheels into ebay, and you get Ram SRT10 whillz. Type Viper SRT10 Wheels and you get a whole different bushel of rollers. OP: Buy a Dakota. I think they'll bolt right up.