This is the best way to convert your non-disc brake truck to modern disc brake stopping power. This rotor mounts directly over your existing hub once you press the original studs out, therefore it does not come with new bearings and seals. Works with common wheel bolt pattern (5 x 4.75-inch), so finding matching wheels or rearend will be easy. DOES NOT WORK WITH STOCK WHEELS FOR 1/2 TON TRUCK ONLY