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| Haynes 911 Owners Workshop Manual, page 236 schreef: Front bumper - removal and installation Several different types of front bumpers have been used. In all cases they are comparatively easy to remove and install, and only an outline procedure is given. When installing, ensure that the bumper is correctly aligned before finally tightening the attachment nuts and bolts. 1972 models: These bumpers incorporate a front spoiler, but are otherwise similar to the 1969/71 bumpers. Early ones are of a fibre-glas type, later ones are of steel. 1969/71 models: These are retained by angle brackets at the outer edges, and by brackets (accessible from the front compartment) on the wheel boxes. The brackets can be detached after the bumper is removed. If a new sealing rubber is required, bond it to the lower edge of the wing with a contact adhesive, and pull the centre section into the shaped rails at the front compartment block bulkhead.  Pre 1969 models: These bumpers are retained by brackets on the wings and spring brackets on the wheel arches. | |
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Niet echt duidelijk, en er zit ook niet echt een duidelijk plaatje bij, maar wat ik wel zie is dat het 4 brackets (beugel, haak) zijn, 2 per kant.
Dan zijn er dus twee ter hoogte van de rozetten en twee op zo'n 5 tot 10 cm van de uiteinden.
Succes!