The wires for the square coils are 1.5 inches longer than the ones for the round coils. That is the only difference. If the customer doesn't know-sell him the set for the 693 coils.
This is a recent release from AC Delco that some might be interested in. This complete pre-made brake line kit could make this nasty job a lot easier.
http://www.shopownermag.com/Item/116710/acdelco_introduces_brake_pipe_kits_for_gm_trucks_suvs.aspx
Look at the valve stems. If they're the black rubber, regular looking type then they don't have TPMS. If they are rigid metal, they do. GM didn't use the regular looking stems with TPMS back then. If you have them and they are good, you should be able to reset them.