Hi Will, and welcome to the site.
Since you have a 97, you should already have a skidplate for the gas tank and the transfercase. Well I have a 97 and I have them on mine. Are they any good? They are better than not having any skidplate at all and have saved my gas tank quite a few times. Where can you find them? well if you don't have any, then you can order them from Ford. The one thing that you will realize is that although the Explorer is the number 1 selling SUV, it isn't supported very much by the aftermarket manufactures, and especially the 95+ models. Don't be dismayed. There is progress being made. If you want really good skidplates, then you will have to have them custom made. I had a skidplate that goes from the rear of the torsion bars to the front crossmember made out of 3/16 plate steel and cost me $128.00. Let me tell you, that thing weighs about 60 pounds. Hope this helps.