all you need is the hubs from the srw truck, everything else is the same and can be swapped from the old drw hubs. assuming that you have a dodge or chevy axle that is....
When I checked like 2 years ago gmpartsdirect.com had SRW hubs w/ races, studs, and rotor for $130 each, which was the cheapest that I could find them anywhere. Might be worth looking into.