To know for sure, you need to determine:
* Bolt Pattern: Find the number of lug nuts and the diameter of the circle they form (e.g., 5x4.75" or 5x120.7mm). This must match exactly. Camaro bolt patterns have varied over the years.
* Wheel Offset: This is the distance between the wheel's mounting surface and its centerline. Incorrect offset can cause rubbing issues. Camaros and C1500s typically have different offsets.
* Wheel Diameter and Width: The diameter (size) and width of the Camaro rim must be compatible with your C1500's brakes, suspension, and fenders. Larger diameter wheels might rub, and narrower wheels might not fit over the brakes.
You'll need to find the specifications for both the Camaro rims *and* your 1990 C1500's wheels (likely stamped on the wheels themselves) to compare. Even if the bolt pattern matches, offset and dimensions are critical for safe and proper fitment. Consult a tire and wheel specialist for definitive advice.