Some easy, some tough:
Red lifter cover: Marco Specialties used to carry the plain lifter covers used for this game http://www.marcospecialties.com/pinball-parts/C-153A
You might email them and ask if they plan to get more in stock.
Bolts: I think you'll likely destroy the metal cladding to get at those bolts. Probably easier to find a lockbar. Joe Shope is probably your guy. His contact info is on the suppliers page on bingo.cdyn.com.
Those plates are almost universally beat up. That's a tough one. A man in the Netherlands has reproduced them, but importing one might be very very expensive.
Legs and bolts - Joe Shope again is probably your first choice here. Bolts you can use any pinball leg bolt, but the legs are specific to the later bingos (metal with extra anti-cheat welded plate).
Power cord - Steve Young (pbresource.com) sells power cords that are universal. If you want a flat one like the original, you could use an extension cord and cut off the female end.
Coin door: Joe Shope. Coin switch: just about any supplier - Bally used microswitches. To test your switch, but your meter on resistance and click the switch down. Measure across the connected tabs underneath and see if the meter shows 0 Ohms. When you let go of the switch, this number should increase.
Buttons: not really. You can check with Joe, but often, you're better off repainting. High Flyer has only the red button, correct?