I know I will most likely take a lot of heat on this but here goes.
I say none because that is the only thing to keep it a different SS 1 or 2.
I also feel there are some of the options that are allowed on the 2TL that are not allowed on the 1SS that is not what I would prefer to see happening.
Sure there are some options that I would like to have also that I might not be able to get them exactly the way I want.
GM has their reasons (mainly to keep production costs down to keep our price down) so I say we deal with them the way they are and make our choices acordingly.
Orderded as seen in my sig