I got the ones from VW Heritage when on offer (think they are made by wolfsberg west)
They slid straight on? I even stuck thick towels underneath them to stop the coconut fibres coming off when they rub against the springs as I had no standard seat material
Did you defo get the standard cab seat ones? they do bucket seat ones as well which Im guessing are a different size?
Also its better to slide them on from the front, rather than try and fold the flaps over, as the husks can snap.