those look great in there! i'm glad you finally got them in, and they went in smoothly. for the seat belts, there should be a hole in the back corner on the inside. if you pull the cover up a little, you should see it. you will have to drill it out some and then bolt/nut your seat belt on.
an explorer console should fit right between those seats. rangers, explorers, mustang, bronco II and several others use the same basic platform. so they aren't that much different in size.