Classic (among others) has the arm rest parts , metal pieces and the cover material....check thier website...mind you that coupes and verts are different on part of it... web page if you have a coupe there`s three pieces ea side , the metal piece that goes in the corner , the lower and upper parts at the arm rest (of course if you only need the arm rest its only one piece, think the metal piece w/o cover material is about $50-55)...not sure if you need all three , or two or only one..?
there are wiring diagrams too , on EBay often , but a few have them on their web sites.....I only have a copy in my book , which currently is loaned out... you may want to put a separate post for "gas gauge wiring" wanted..or wiring diagram wanted so its easily recognized by the ones that have it online for 68...