What parts can a 1973 Swinger use from other Swingers?

I was also going to say, let us know specifically what your looking for. I am just finishing up a restoration on a 73. There are some parts you just cant get new like upper door panel plastics so you will have to find used. The A pillers are available for the early up to 72. 73 was different, they are wider on the edge and have grain pattern. However, the early ones will work. So there are alternatives to some parts even if they are not correct.
BTW, year one has a lot of parts but its damn near impossible to find anything on their website. Whoever designed that site is a huge failure in life. Classic industries in a little better but their prices (especially shipping) make you feel like you should call the police and report a rape.
As mentioned, 73 was a one year only window glass and regulator. In 73 they went to the full window and then in 74 the regulator design changed as did the mounting holes in the glass.
Most of the body panels are available except fenders and hood. The grill is being repopped and should be available soon. Let us know what your looking for and we can point in the right direction.