Hello all. I have a 97 Caterham R300, with Rover K engine. The expansion tank cover came off and I am having a nightmare of a time finding a replacement. I have been to Caterham Parts a few times directly, they have sent me a wrong part and offered little insight into how to find a correct one. It is a snap cap type lid, happy to share pictures but am open to all suggestions around how to figure out the correct party. O'Reilly's and Autozone have also been dry wells.
Any insights or ideas are welcome - I have resorted to buying a ton washer fluid lids and trying to brute force which one stays on so anything better than that is welcome.
Thank you in advance for any insights from the community.