If you want to mount a fibreglass bumper on an 911 G body they usually come without any mounting brackets. The brackets are made so you can use the original mounting points on the car. The front center brackets need a speed nut and a M4 riv nut. You can use the OEM 96450502101 rail to clamp the bumper to the center mounts. The side mounts are used to support the load of the bumper.
Use a material that can stand some heat and can handle outdoor influences. Personally I used PETG with carbon reenforcement.
DISCLAIMER: Not for road use.
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