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This is a scale 3 inch single tube roll bar that fits RC4WD Blazer pickup conversions. It could also be used with a K5 Blazer body. There are also two tabs on the top for mounting lights using M3 screws.
To attach it to the body, mark the center of each mounting plate and drill a 1/8" hole. Then attach it with 4 M3X8mm screws from the bottom.