For the airbox what do you have? Any of the rubber boots or just the bare carb intake?
Rear plastics are gonna cost you about $300 from maier. I don't think any others bolt up but you can always get creative.
As for the lights it just depends on how much more $ your willing to spend. You can go all original off of eBay and you run the risk of getting hustled on some old parts. I say just be creative and pay attention to the details. You will figure something out. My 85 is a mix of all types of atc's.