Can anyone identify these?

What did you find it under?

 

I just put the part number D0DZ-16758-A in the Ebay search box. More might be able to be found using different wording

 

Nothing comes up for me when searching that part number.

 

Your right - the search results were 0 and I was looking at the "More items related to "D0DZ-16758-A" and saw the fender bumpers for the Mustang------

 

Yes, the fenders need to be removed. I do have a used set if anyone needs them.

 

'Sorry for bringing this back to the top, but I've been wracking my brain and can't for the life of me figure out what purpose those things actually serve.

 

They support the edge of the fender along the cowl area. There are no bolts along that edge. That part of the fender is kinda floating there. So, these bumpers support it from underneath. If you push down on that part of the fender once installed, without the bumpers in place, the fender will dip and come in contact with the cowl.

But like anything else, if you are happy not using them, then life is good. I would bet that they are missing on more than a few cars around here and no-one seems to have a problem.