Interior seat swap
I believe the 67-68 buckets were the " Buddy Seats ". The center console doubled as a seat....very desireable and rare. The 69-72 pickups had an option of buckets that were available. Living in England, your best bet may be Ebay or Craigslist if you have it. Also, the 69-72 Blazers and GMC Jimmys had buckets and consoles (which didn't work well as seats) that will work, except for the fact that the passengers' seat has a quick release mechanism that allowed the seat to lean forward so that entry could be gained to the rear passenger area.