Noob - 2003 Prius, Where to buy used body parts?

Hi all,
Just scored a screaming deal on a low mileage 2003 but it needs a new rear bumper and rear passenger side door. I figure I should replace these and paint the car. Mechanically, the car is in good shape and gets 44.5 mpg over the first 1500 miles I've driven it.

I don't see a sub forum for the Gen1. Where do I go to read more about the first model? Where is a good place to buy body parts for this car besides the local stealership? Also, I'm thinking it needs new shocks. Can I get a decent shock like a Bilstein HD for this car? I'd love to stiffen up the ride a bit as I'm not a fan of a floaty ride. Nothing crazy like a track car but just a nice firm ride.

Thanks in advance.