Hi Dave, and welcome to TMW! You've come to the right place, our community of enthusiasts is sure to have some suggestions for you.
I can't speak to what modern or modern-ish parts might be compatible with your bike, and my assumption would be there'll probably be some custom fabrication involved in making newer components work properly. For OEM, the standard list is usually the best place to start, i.e. Craigslist and EBay. You may also have some luck checking around for other forum communities specific to the older Zukes, there's sure to be a couple (just make sure to come back to TMW and share your experiences!). Finally, I've had some luck with wreckers that maintain an online presence, there was one place in South Dakota that supplied me with an almost perfect chin for my wife's Ninja 500. I'll have to check my records and see if I can find their name, it was a couple years ago.
Best of luck, and I'll wager someone with more experience than myself will be along shortly with a better answer.