Just came across your story on the Typhoon..... I owned that car in England back in the late 60's early 70's Registration LTB 413. I sold it when we emigrated to Canada in 1977, it was a runner and went with a box of Aquaplane parts I was going to install. The turn lights I put on from a VW... as you say, not standard :) I'll see if I can find any more pictures... no digital in those days.
With the likes of a Typhoon, you may well be stretching things calling them incorrect tail lights. The lights might not have been what Typhoons typically came with, but it doesn't mean the factory didn't send some out with those lights when the typical ones were for some reason hard to get hold of at the moment.
Seen this sort of thing many times, in vehicles and items far more mass produced than a Typhoon.
Very cool to find direct info about your particular Tornado survivor. FIAT flipped back and forth between an in-hose thermostat and an in-head one for a few years in the early-to-mid '70s, depending on what was cheap /available at the moment. They did that with other cars and parts as well.
It is so cool to start connecting with the people that built and owned this car. I spent time with and England and have gotten to know the founder of the Tornado car company too.