I have several spare front bumpers and turned one over and examined it carefully yesterday. The shock mounts attach to the center section and there are 4 10mm studs which atttach each side. These have zero adjustability and hold the center section firmly in place. The side pieces are riveted on to the center section with HUGE rivets at the factory and the wrap around ends attach to the bodywork with the infamous Vee headed bolts in the slot with the big round O. There seems virtually no way for the side pieces to droop as in your photo unless the huge factory applied rivets are loose or have been replaced with something which is too small for the job. It they were replaced with some form of attachment hardware in place of the factory rivets; something with a diameter too small to fill up the hole made for the rivets, then this would allow the side pieces to droop like yours are in your photo.
If I were working on your Spider, I would remove the bumper assemble and examine the rear of it, looking closely at how the side pieces are attached to the center section. Just guessing, but I am leaning toward someone having de-sectioned the assembly and replaced the huge factory rivets with hardware too small in diameter for the job. These huge factory rivets are so big that it would be very hard to duplicate them if you ever drilled them out for whatever reason.
The front bumper is relatively easy to remove on your model. unplug both front lamp assemblies and side marker assemblies. Remove all 8 of the 10mm nuts holding the center section to the shock mounts. The Vee headed bolts will slide back to the O in the slot and the bumper comes right off whole. It helps to have 2 people handle the removal so as NOT to scratch up any of that beautiful red paint.
I will take some photos after first light and add them to this post, showing what I am takling about.
Robert Hill in Memphis, TN