They're out there try out west California, Arizona , Texas, New Mexico, and also the southern states for a 78-79 Bronco, you'll find a good one, also enlist the help of your friends, that's house I had found my 78 F-150 Ranger Lariat is that a friend knew that I was looking for a 6th Generation Ford truck, at the time I was looking for a 77 F-350 Custom dually with a 10 foot flatbed / stake body for that's what I had for my first vehicle, but the 78 F-150 had crossed my path, and it was mostly restored / survivor truck, but all that mattered to me is that it was a Dentside (6th Generation). Good luck on finding your Bronco that you want. And don't give up! They're out there, also check Craigslist, and eBay aka Fleabay for one as well hope this helps you.
Guy i sold truck too is gonna put a plow and salter in it. I was like WTF did u buy such a nice truck to do that too. He couldnt find a big POS to do that too. Oh well got my money