Got this similar to the picture.

Brought the coin door from member here and now would like to attach it, so need to know what type of screw to use. And NO, I am not talking about attaching it to the cab, just attaching it to the frame. Currently just sits in there and hope nobody kicks it.

Bottom section is lock and don't have key, so can't really check and don't really want to take it away. Coin door is more of a show piece than anything.
thx.