Please educate me on fender extensions

Thanks. My car is an early 71 so I guess it got left over 70's on the driver side. All factory hardware and original color (or maybe it got hit on that side back in the day). The passenger side definitely got replaced with '72 I guess.

XS2

71 Demon here, had been parked since 1986 with original dented up fenders and it has fiberglass extensions ...build date of 9/6/70 on the tag