I have the oem Honda ones here......
http://www.ek9.org/forum/sale/50825-eternals-engine-bay-thread.html
They are 25mm.
It only took me less than 10 seconds to find that on a quick google searchThank you very much 👍
Yes Lewis I would advise getting a genuine one from Eternal I found it very good, If you want a good seal go for genuine.
The fun we have pushing in the cheap grommets my mates have![]()