My 360 Spider had scrape pads under the front bumper when I purchased the car. They appeared to be pretty standard, made of HDPE or some other soft plastic, and had suffered some abuse over the years. I wanted to replace them but I didn't want to just buy new ones. Instead, I chose to manufacture my own using Fusion 360 and a Prusa MK3S+.
Digitizing an existing part can be tricky, even with a 3D scanner. If the item is relatively flat, a simple method of digitizing uses finely lined (1/10") graph paper and a camera. Line the object up on the graph paper so it starts at an even measurement, and the take a picture directly from above, at a fair distance away from the object to reduce spherical aberration. In this case, the old scrape pad fit easily on one sheet,
Fusion 360 has a very nice feature for importing images to use in their system. Once imported, a simple scaling operation gives the height and width. Tracing the outline and holes is quite easily
The original scrape pad, origin unknown.
To mount the nut keepers, they were installed without any adhesive, with a #10 washer under the nut keeper. This provided a small space between the nut keeper and the fender inner surface so that the glue could be applied with a syringe around the nut keeper, into the holes and slots in the "wings". This proved to be quite easy and low mess. I used a total of twenty CC's of epoxy gel (Gelmagic of course) to secure them.
Here's the scrape pad installed.