This is an additional mini kit for converting your 2-door Hummer into a 4-door version. This is a mini kit that contains only rear door parts, roof parts and other parts needed to build a 4-door version.
To fully convert to a 4-door Hummer, you also need one of the basic sets:

4-door Pickup conversion kit: link

Slantback conversion kit: link

Wagon conversion kit: link

I have a Facebook group, if you have any questions you can ask them there link