I agree with SC850 - anything can be replaced, glass, wiper motor, all that crap...
I have an inkling that it's actually a MK1 Cooper S - a later MK 1 S, with the wipers parking on the passenger side has the body number prefix M206, the logical precursor to that body number prefix is M205. Problem is, the body number is too high, there were only 5400 MK1 Cooper S's - the number should be less than that, I'd say somewhere around the 3000 mark.
Given that the right hand tank hole has been filled by a previous owner, I'd say it's fairly likely that someone had an S shell, and wanted to turn it into a normal mini - remember that back in the 60s's and 70's, Cooper S's weren't that special, just another mini....
I want to ask some questions about the car...
does the bootlid have about 17 holes around the edge of the inside?
is there a small hole in the vertical panel under the front seat, to the left in this pic?
notice the vertical/angled brace under the bonnet shut panel is missing, and there is a piece of metal cut out of the lip at the bottom of the grille opening?
has the gearshift hole near the crossmember been cut out neatly, or messily hacked?
the subframe sitting in front of the car is dry suspension, but that's an easy conversion. None of the pictures give evidence that the car was originally hydro, but it's hard to tell on the early ones - there should be some holes in the front and the rear of the floor
the most likely origin is an early deluxe, but you never know!!
PM sent also

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