on early cabbies up to about 83, the front seats are the same as a tintop MK1. After that the seats are the same as a MK2 golf

As for the rear seats, they are completly different to MK1 tintop seats due to a strengthening cross member just behind the seats.
To fold em you have to open the tailgate and pull the knob there out, then go inside and find the rubber strap next to the rear seat, usually on the passenger side. Pull this forward and the rear bench should fold down.