This is the thread I did when I converted my truck to buckets.
https://67-72chevytrucks.com/vboard/...d.php?t=845608
In short I used 66/67 Chevelle bucket seat tracks and made my own risers and adaptors on the seat frame. Then on the floor I used the stock bench seat holes on the outside on both sides and then put a strap across and dilled new holes to hold the strap down. Then I drilled and countersunk some screws to act as studs in the strap. Thats all under the carpet and only the 4 studs poke up for the seat to bolt to. Its setup so I can easily remove the seats and console by myself if I need to yank the tank for any reason.