Only 70 and 71 Challengers had the angled marker light.
All other years had the rectangular marker lights.... or what some people call the "lick 'em and stick 'em" style of marker lights.
I would bet that your "wrong" fender is from a 71...
There are quite a few difference in parts for all of the years of Challys... Most people assume that all the parts interchange, but quite a high number of them don't. They may be able to get them to fit, but they never actually fit properly. Especially major parts like body and interior parts.
Here's what I know...
1970 Challengers used three different sets of fenders:
1. Standard fenders.
2. Cars with F60x15 tires required special fenders for clearance.
3. And as someone said earlier, T/A's used their own fenders. (Fenders made for regular Challengers or Challengers with F60x15 tires will *not* fit a T/A because T/A's used a special radius in the wheel opening and never used chrome wheelwell moulding.)
1971 Challengers used two different types:
1. Standard fenders.
2. Cars with F60x15 tires required special fenders.
(if you believe there was a 71 T/A made, you can probably assume it had the same criteria as the T/A from the previous year)
1972-74 Challengers used one set of fenders. One size fit all.
Sorry I don't have any photos though...
Aside from the obvious grille differences, later models of Challenger had all the extra collision stuff in the front end too. The bumper sat at least 2-3 inches further forward than the earlier years, and also had a ton of crap inside it. Supposedly it was supposed to protect you or something...
Really, it all just added weight.