I've read the link you've postet. Can you post a picture 1981 without fuel cap door lock.gt_james wrote: ↑Wed Jan 22, 2020 9:10 pmI've never seen an S2 with that lock in the UK, all the ones i've seen look externally the same as the S3. In the US, the S2 got the bigger fuel tank.
"Fluid Capacities:
Fuel tank: 14.5 gal (1979 & '80) 16.4 gal (1981 & later)"
https://www.rx7.org/public/1st-gen.html
I can only assume fuel cap door lock was different in germany
1981 - '85 Few differences among them.
Electric fuel filler door release standard. In 1983 the key
operated fuel door release was eliminated.