So 2 thing:

1: i have a 72 swinger, but im not loving the grill. Any other years that will swap right on in or anybody know of any custom grills?

2: i have a rust hole under the passenger drip rail right by the rear quarter window; am i screwed or can i just fill it with bondo?

Welcome on the board.

'70 and '71 Dart grills will swap on directly. They are not easy to find in good condition unless you are prepared to pay large money, and the turn signals are smaller and dimmer.

You can fill a hole with Bondo, which will make it more or less disappear. But under the surface it will keep festering and growing worse, undoing whatever other body/paintwork you do. If you're not just trying to slap the car together on the cheap, the repair should be done correctly (metalwork). Perhaps at that same time, you can paint the grille body colour (or just the parts that are argent silver now, or just the parts that are black now) and then you might like it better.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

All rust should be cut away and new metal welded in it's place. It can then be shaped with body filler. It is not really hard to do if you have any metal working skills.

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1976 Feather Duster /6 4sp
1984 W100 318 727 np241
1972 'Cuda 340 4sp
1985 D250 360 46RH

I have seen interesting grilles made out of metal mesh. Don't be afraid to get creative with materials available from your local home improvement store. Just be sure air can still get to the radiator.

If you try a homemade grill, be aware that the parking and turn signal lights have to do a lot more than just light up. There are detailed construction, performance, and size requirements that have to be stuck to, because this is safety equipment. "Yep, I can see 'em" isn't good enough. If you don't keep the original lights, there are plenty of options for good ones that will work—pick your size and shape, like these—but make sure you pick actual front turn signal lamps. Rear turn signals, marker lights, and other functions don't substitute safely.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.