If memory serves me 15x7 was standard, 15x8 optional on the 97. Ours has 30x9.50x15's, on factory wheels.
But again the memory thing, I think the TJ's use a metric spacing like 114 mm, a smidgen under 4.5". might want to check to be sure the wheels will bolt up, and that the centers are proper for the Jeep hubs first.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.