factory bucket seat mounting?

[Prerunner1982]

does anyone have a picture of the floor of a factory bucket seat truck? I looked at a 77 silverado today, I was told that buckets didnt come until 78.. i was thinking if i got this truck that i could swap buckets to my truck and my bench to this truck.. for my wife to use. however... there are additional mounts welded to the floor of the cab, look factory.. painted the same as the rest of the floor of the cab.. were these tabs used on the bench seats in 77 as well? btw.. i have posted pics of this truck before but its a...

1977 silverado shortbed
crate 350, auto, 12 bolt rear...
TACH dash, sport mirros, and sport bumpers (non step)
with bench seat and console

said i could have it for $1300 cash..
it has the typical rust spots, but they all seem to be on the passenger side. front fender, cab corner and rear fender.. also needs a carb rebuilt. would be a good project but i need something for my wife to drive.. this wouldnt be bad.. runs good, just needs a bit of work..