Dimensions?
Needs to be 114.3mm bolt pattern. That translates to 4.5 inch. 5 lug obviously.
Factory wheel offset is 55mm. People have gone as low as 35mm, but depending on wheel width, that might cause the tire to rub the fender. Factory wheel width is 7.5 in, with 8 and 8.5 being accepted as plenty wide enough for anyone not producing power too much greater than stock. A few member have used 9in wide wheels. This required either fender work, or in one case an extremely hard suspension with almost zero travel.
It is possible to fit up to a 19in rim without noticable fender rub.
The dimensions I would shoot for when looking for a wheel would be 48-53mm offset, 8in wide, 18in diameter. 16 and 17 diameter if 18s create too harsh a ride for your taste. 7.5 wide if you are going to use this wheel in snow.
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To give you the most basic of answers for your question, (correct me if I am wrong here) any rim that matches the bolt pattern will "fit".
EDIT: Any rim that matches the bolt pattern AND fits inside the wheel well will, well, fit.