70 K10 Custom Wheels?

[Kregb]

So I jumped off the fence and bought a project truck. Nice truck if you don't mind watching the road under your feet. It's a driving project in so much as I need use it from time to time, moving stuff pulling a trailer etc. The wheels are plan Jane stock steel 15 inch in other words boring. I would like to put something custom on it without spending more money on the wheel than I did on the truck. It also seems that the 15in options on wheels and tires are getting limited. So what wheels from a more modern truck still fit the older trucks. I keep seeing ads that list the C10 4x4 and Toyota as the same but I'm not sure what years are direct bolt on or what Toyota models are the same bolt and backspace is there a fit guide anywhere?