It could just be a standard 2.0 or 1.6 Shell. My mate has a 1984 3dr on an A Reg. Only the XR4i's had the Pillars, not the 1.6 and 2.0
I got a message back from him on ebay saying that it was purchased as a cossie shell with no ID and he put 2.0 numbers in it to avoid having to Q Plate it! Hmmm