Based on the 911 RSR fuel and oil caps, we have reproduced some weld on caps that are 115mm OD and 80mm OD respectively.
@mckernan_restoration are going to be using them on their incredible carbon fibre 910 as well as on some other projects. The oil cap will be through the front guard and the fuel cap will be through the rear guard as shown in the last picture.
Send us a message if your interested in some. They're not for Porsches 😉