* Bolt Pattern: The number of lug nuts and the distance between them (bolt pattern) are almost certainly different. Camaros typically use a 5-lug pattern, but the specific diameter of the circle formed by the lug nuts (e.g., 5x120mm) varies by year and model. 1991 Chevy trucks likely have a different bolt pattern. This is the biggest hurdle.
* Wheel Offset: The offset (how far the mounting surface of the wheel is from the centerline of the wheel) is crucial. Different offsets can cause clearance issues with the suspension, brakes, and fenders. Camaro rims are likely to have a different offset than a truck rim.
* Center Bore: The center hole in the wheel needs to fit snugly over the hub of the truck. A mismatch here will be unsafe.
* Wheel Size: The diameter of the rim (e.g., 18", 20") and the width (e.g., 8", 9") will affect fitment. While the Camaro's might *physically* fit inside the wheel wells, they may rub against suspension components, fenders or brakes.
In short: You would need to know the exact bolt pattern, offset, and center bore of both the Camaro rims and your 1991 Chevy truck to determine compatibility. Even if the bolt patterns match, the other factors could prevent a safe and proper fit. It's best to consult a wheel and tire specialist or use an online wheel compatibility calculator. Trying to force mismatched wheels onto a vehicle can be dangerous.
