'67 K20 frame/steering differences

[JMD]

Hey guys, I'm a new member and I just bought myself a basket case '67 K20. I was planning to wait until winter to do a full restoration and just drive it for the summer, but the truck is in a lot rougher shape than I had thought. So now it sits in my barn, completely torn down to the frame and waiting for parts. The problem is, I can't find any parts! So tell me, what is it about the '67 4wd 3/4ton frame/chassis that makes it noninterchangeable with any other '67-72 models? I'm looking for steering components such as a drag link and a tie rod sleeve but I'm not getting anywhere. Will steering/suspension parts from a K20 suburban work? Any info you can provide is appreciated, thanks.