98 explorer rim question

so i have a 98 ford explorer sport and i believe that my rim size is 16x7... well i want to buy new rims and would like to know if a 18x9 rim would fit?? this link is the rims i am looking at ...

http://cgi.ebay.com/ebaymotors/18-B...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

any advice is helpful, i dont know what offset or bolt pattern i need and i just want to make sure they will fit... please help