Bench Seat slider brackets ID please

[ck5566]

I have been told that these are for the 67 & 68 C10's/20/30. I have been showed pictures that they say were 67 & 68's, to me the pics I have seen are different from each other. I have also been told they might be from 60-66 trucks. So that's why I am here to ask my question. Are they from 60-66 or might they be from another year. They came off a 72 C20 and they look like whats on my 68 C10 also. What do you say Guys & Gals (can't forget the Gals)