I think I am a long ways from buying chrome inserts. Currently I am trying to sell all the different wheel combinations the guy gave me with the car. Also about to tackle that PITA spark plug on the pass side.
If your talking about the rear two plugs on the pass side, get a spark plug socket (you can cut it shorter and that helps even more), then slip a ratchet wrench over the end of it. Access from the bottom. Easy.
Looks like you got a major score if the price is right. Car looks mostly complete and straight. Congrats!