I have seats out of a 06 Silverado in my 81 c20 Scottsdale. They are the 40/20/40 seats like the ones the other member posted a pic of. 
I had to strip all the mounting brackets off the seats and fabricate my own. Took about two 8 hour days when I was on vacation so I was also working at a I'm on vacation pace lol. 
As for fitting and such they look and fit great in the cab and there is very little gap in between the doors and seats. Now I'm 5-10 and all I will say is I put mine in to fit me since there's no foward backwards adjustments any more, the backs just fold foward to access the space behind the seats. My friend is 6-3 he borrowed my truck once he said it's ok to drive but would have mounted them farther back so hopefully that helps. 
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