The spoiler is just a lund windjammer, you can get it at any autoaccessory shop. I believe I go mine from carparts.com. I do have 1" spacers for the wheels, but there is a slight problem with it. They are the good kind that have their own studs, and you just bold the existing to the new spacer. But the existing studs are about a 1/4 inch too long, and the stick out and prevent your from bolting everything together flush. I work in a machine shop and chopping the studs is no problem, its just a matter of taking it all apart so I can cut them.
About the billet grill, as far as I know no one makes the lower piece for a 99 sport. I think it would look awsome with it too, but I cant find any for my year. Yes my truck is lowered the 1 3/4 inch drop. Whenever I put my new spoiler on I might go ahead about buy the explorer express air dam for my truck. I think it makes it look pretty wicked.