USE UNLEADED FUEL / BLEIFREI TANKEN
 
English White used on UK cars from 1992
German Red on German cars to 1988
German Green on German car from 1989
 
There is a driffernt red version for e24/28/23 
 
https://www.pukardesigns.com/product-page/bleifrie-tanken
 
These are NOT for e30 M3 
 
for M3.... 
https://www.pukardesigns.com/product-page/super-petrol-flap-variant