Basin Plug Washer

I have a two and a half year old Elddis and find the washer on the click clack basin plug is starting to fail and fall off the plug. It is not an O ring washer but T in cross section.

I find these for sale at plumbers merchants on line but not in the small size I require, 26mm, 1''.

Went to a caravan dealer, not and Elddis one, parts department couldn't help.

This part failure cannot be unknown.

Any suggestions where I should go to get a replacement?