This is something ive noticed on my car a while back but hasn't caused any trouble till now. my front guards appear to be slightly differant, the drivers side guard has a crease around the wheel arch which ends at about the same height as the bumper, while the passenger side guard has the crease continue right down to the end of the arch. With my new wheels the drivers side guard is fouling at anything past half lock while the passenger side has plenty of clearance.
I did replace the drivers side guard with one from a sedan when i bought the car so is there a differance between coupe and sedan guards?

Sedan and coupe guards are the same (same part number in my spare parts book). Only difference is between early and late models (position of indicator) rather than between body style.

I've got half a dozen various 180B guards and none are like your passenger one, perhaps the wheel fouled on it and the previous owner modified it by turning the guard back on itself to form the lip, so the wheel cleared ?

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady