I would take a wheel off, clean off the brake dust and read the inside of the rim. Don't go by just the center cap.
It should have the make, size, etc.
98 TJ,4.0, 5 SPD, 4' SPRINGS,RC 2.2, SYE W/ TW DRIVE SHAFT, JKS ARMS,JKS ADJ. TRACK BARS, CURRIE ANTIROCK, ACOS ADJ, REAR D44 W/ DISC BRAKES, 62 MM THROTTLE BODY, POISON SPYDER SLIDERS, LED TAIL LIGHTS, K&N INTAKE, THORLEY HEADERS, FLOWMASTER EXH,H4 CONVERSION, 35" BFG AT