If you can't clean up and rebuild the socket for the directional, a used light may be you best bet. Try a dismantler as even a light that's been destroyed may have the hardware you're looking for. Also, you may be able to fabricate something usable from universal parts at your local auto parts store...
Not sure what a bumper light is. If you are referring to you side markers, the lights themselves have a bracket built in. These are standard Hella units and both amber and clear can be had form various e-Bay sellers for a reasonable cost.
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