Just on the VIN numbers I have came across a few 17 digitis 131's that are 1979 cars
One is a Sport that was first registered in the UK March 1979 with ZFA 17 digit VIN
I came across another & then a few Super's too.
So there are 3 types of vin on the Sport/Racing.
The 1978 AK then 7 number type with the 2 VIN tag's, then the 1979 ZFA 17 digit with the 1 VIN tag & like the 1978 AK type where the VIN number is stamped on the shock top it's masked off & left bare metal, then the 1980 ZFA 17 digit with 1 VIN tag its painted like the rest of the shock top & not masked off like the 1978 & 1979 cars.