#8 pro is great all around for DC steel and AC aluminum and budget-friendly, it mounts using supplied orings 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 surely use it, Keep in mind that import brands yield lower results.
Please see identify page for torch description.
8 pro is recommended for Steel and Aluminium.
