'69 Fender on a '68 Dart

Yeah, the top flange (triangular shaped piece at the top of OMM's second pic) is completely different which affects how the grille mounts, the headlight buckets are positioned differently, the side marker issue... lotsa messin' around to get them right.
'67s are a whole lot closer than '69s.
I'd keep looking- they're out there.
Heck, you're not all that far from AMD. Just go get some new ones and save yourself some headaches.
Body Components - Fender - Front Fenders Body Components - Fender - Front Fenders