hi guys got a leak on my radiator on the passenger side and i think its the temp sender/sensor? it leaks a small amount but enough that i need to keep my eye on the level. i have been to skoda and they dont do a washer for it. any ideas what i could use as a replacement? cheers

copper washer from local motoring shop ?

ptfe tape?

liquid pipe thread sealant ?

Or a Dowty washer if you're feeling flash, and can find one the right size.