as with most kits, it is 2 parts.
you can have all new under hood, or all new under dash, or both.
most fittings are standard, so you can mix and match.
They recommend if your condenser is in good shape and evap, reuse them, but get a new dryer.

If you want your underdash fixed up, they restore them as well, so you can reuse your old setup underdash, and the new setup under hood.