I saw a set of factory tires for a 99 explorer for sale and was woundering if they woulf fix on my 92 what about these?http://us.f1.yahoofs.com/users/ae559333/bc/92xlt40/Auto_hubs.jpg?bcMKSl8AJAuM1BHa

Yes, you can get bigger tires. the factory ones your referring to i bet are the P235/75R15? If so they will fit no problem. you might have to change the speedometer gear if the tires you have now are smaller, but other then that no problems.

I run 31x10.5 Michelins on the stock aluminium wheels on mine. When I first got them they would rub on the plastic inner wheel well in fron on tight turns (usually backing up). As long as your shocks are good and you aren't going with wide wheels you should be okay. The speedo on mine reads about 10% low (if it says 55, I am doing 61). Changing out the gear would have been easy, but I only plan on driving it another 100k miles or so.

If you have the 3.27 gears, you will be sorry if you go with bigger tires. My 3.73's are just bearable with these tires. It has gotten better with the new breather stuff...

Your driving another 100K and don;t want to change the gear?! It is only $10 and is really easy....
Anyway I run 31.7" michilins and a 3.73 and I am very happy with the power. I get better gas milage because of it. the 3.73 gives bad gas milage on stock tires, but with the bigger ones it is fine.