[455-4+1]

Hi all, can anyone shed some info on removing the rear interior panel on a 63 Cat 2dt HDT. I have the door card off, and the rear armrest section with the ashtray came out easily, ( 2 screws at front). But the rear vertical panel ( would be a door card if it was a door) doesn't want to budge. There is a strip that goes down to the sill, not sure if that's connected or separate, and also a squareish plastic molding up the side of the rear seat. Possibly seat base, then back has to come out 1st to get access to fasteners ?.
Cheers