what you might be calling the "chassis" is actually the Steel Bumper, the bumper COVER is the ABS plastic, finishing part.
the Steel Bumper is welded to the chassis, you might be able to wrap a chain attached to something like a light post and pull it back while slowly accelerating in reverse, or go to a salvage yard and have them cut an undamaged one for you and re-weld it to yours.
I have a used front (and a rear) Bumper Cover but it is expensive to ship and expensive to pack it to protect them in shipping.
I also have used headlamps, not the Metal behind the headlamp, but the plastic headlamp itself, with the Plastic Bucket behind it; the lamps are foggy from aging but not cracked. The "fog" can be polished off but I found some good ones at a salvage yard. You can also get new reproductions at eBay for around $70.00 a pair. (one is LEFT one is RIGHT).
what exactly do you mean by "radiator support"? If you post pictures it would explain better.
