#8 pro is great all around for DC steel and AC aluminum and budget friendly, it mounts using supplied o-rings and has a 200 AC amp limit.
If you have a #17, #18 or #26 size torch you will need a #17 kit.
If you have a #9 or #20 torch you will need to have a 45V44 gas lens, If you have one already you can surly use it, Keep in mind that import brands yield lower results.
