FX vs FE rear fender comparison

I just acquired a 2010 FX 450 and I am trying to make it street legal. I ordered a Number Plate Carrier (81208016000) for an FE
and it looks like it is close, but not exact. I wanted to see if this would fit before ordering lights, etc. The 2 middle screws line right up but the inserts at the front don't seem to work with a
standard M6 flange bolt. They start to bind like the pitch is wrong. I don't want to force them and strip the insert. The 2 at the back look like they would screw into the fender somehow.
On the FX there is no hole for the rear screws. If I have to drill, then so be it.

Does anyone know if a whole new fender for an FE (Part# 8120801310028) would fit on an FX?

Also, I am wondering where the wires for the light should route? Again, I may need to drill a hole somewhere to make it work.

If possible, can someone take a picture of the underside of an FE rear fender so I can see how it is supposed to be?
Thanks!

The front inserts were just corroded. A fresh M6 tap and a little WD and it went in with just my fingers, so that is sorted out.
Also, I am wondering how to best mount a license plate using just these 2 holes. Is there some other bracket that attaches here?

This might do the trick as well:

To follow up on this, I ended up ordering an FE fender from Rocky Mountain MC. I think it was the 570 fender, but it bolts up perfectly. It has all the right inserts for the light bracket. The FX 450 decal is unavailable, so Decal Works made this for me.