Friend of mine has an '83 and it does not have the master/servo combination, so what year is this car anyway? Buyer beware.
Lots of things could have been altered/fitted but rear (C post) seatbelt mounts weren't fitted untill 1989 & that looks suspiciously like a round fan hole in the inner wing -which makes the shell 1991 at the earliest.
Wouldn't have bid on it what with the sellers feedback - but this one stinks.... a car given an earlier (non-tax exempt) registration - why would someone feel the need to give it a different identity even when it made the car worth less than it would have done.
I have an 84 and have worked on an 83, both A reg, that both have/had the seatbelt mounts welded to the shell from the factory. The 84 being my own the 83 being one I fitted rear seat belts too. Both of witch were never fitted with rear belts from new, that wasn't until late 86.