I got mine through SC&C (
www.scandc.com ). Mine have the steel bushings, and are not the lightweight versions (cheapest ones).
I'm not a big fan of the B-body spindle... I don't know if you've researched it much, but the location of the steer arm doubles the factory bumpsteer, slows the steering ratio, widens the turning radius, and messes up the ackerman. They can be found cheap, and places like GW and Hotchkis still sell them as their premium spindles, but there are way better options available now. I'd rather see the money spent on fixing the geometry the right way, than go toward something purely aesthetic, like bigger wheels.