Combo 1 - Front, Back Type 1 (sides attached to back)
Combo 2 - Front, Back Type 1 (sides attached to back), Center screen guard
Combo 3 - Front, Back Type 2, Sides
Combo 4 - Front, Back Type 2, Sides, Center screen guard
Combo 5 - Front, Back Type 2
Combo 6 - Front, Back Type 2, Center screen guard
Front only
Back only Type 1 (sides attached to back)
Back only Type 2