Thanks for posting all of this, VERY good reference. Excellent restore!
You're also one of the only early "series 2" cars I've seen posted in depth. My car has always confused me as I have the S1 center console, S1 seats, S2 rear hatch and S2 c pillar/side vents. My SN is 43xxx, fairly close to yours. One very interesting thing to note on my car, that I've never seen posted or mentioned anywhere, for my shifter cutout/hole in the tunnel, it is actually a S2 cutout with a spot welded in block off to make all the S1 parts fit, rubber boot, center console, etc. I noticed this when I converted to 5 speed, dreading that I had to cut my chassis, I only had to drill out 4 spot welds and the panel popped out perfect and the S2 rubber boot dropped in.