Autocadsteve: Read your question again, and im not sure if you will be able to run the rulox wheels up front unless you dont do the mod and just buy the standard b4 rulux wheels. but i guess you can try running some treaded 4wd front tires and wheels on the front of your b4 and see how that goes.
thought about it some more and got up and looked at the differences between the standard 2wd b4 front wheels compared to the b44 front wheels and they seem to be just as wide but the off-set is alot different. So unless the losi spindle mod makes your front end wider then you could run the 4wd rulux front wheels. If not then you cant run the rulux wheel
and that would suck and make it not worth it unless you dont care and buy all new regular dish wheels.