Not sure on brands. At one time, all the vendors sold offset bushings; it may mean that you will have to contact your favorite parts-seller and ask. The difference in bushings is simply the thickness of the flange machined into one end; a thick flange means no offset and a thin one means some amount of camber offset relative to 'stock'. There's normally no big price change for camber increases.
And of course there's your main problem: getting the stock rubber & their steel sleeves out of the a-arm loops without damaging the arms. To avoid the problem,. some poly bushings are/were made to fit inside the hard-to-remove steel sleeves of stock bushings.
Note that the stock a-arms are only mild steel and can safely be weld-repaired by a decent welder with oxyacetylene and a file, and anyone with a small lathe could make his/her own custom a-arm bushings, with the help of TAP Plastics. Polyurethane rod-stock is available in all kinds of firmness (durometer).
Bump-steer results from the steering rods NOT being perfectly horizontal. So you can reposition the entire steering rack, or just the tie-rod ends (with heim-joints), to level the rods. That of course means that every car will be a bit different; the stock '73-up rack spacers are an average correction but bump steer on your particular car may be correctable with more.... or less spacer thickness. Wheel & tire size may have an influence too.