I have been wanting to do this to my '96 explorer sport for years...
Glad to hear it! Here's a couple of other tips - if you have the factory sub installed in the cargo area, you need to get to a wrecker (or Ford if you are rich!) and get the 'pocket' piece from a truck that didn't have the factory sub - the reason is that you need the 'trim ring' from the pocket for the JL stealth box sub install - you can do it without it, but it's more work for the installer, and I think it looks better with it - as you may notice, I don't have it - my installer just 'did it' without without talking to me, and now it's a bit too late - but no big deal. When getting the ring, be sure to remove it 'carefully' from the pocket - it has these rotten little 'speed clips' that really aren't speedy, but boy do they clip! It's very easy to break the tab on the ring as you remove the clips...
The face plate - I have two pads of high density foam stuck on either side of the face plate, little trianges, with the > end pointed towards the front - that is what holds it in place - it's an absolutely perfect fit. I got the foam from a Dlink DSS 8+ switch I bought, it was supposed to be used for the bottom leg pads, but I found a better use for 'em!