Commando S type seat trim

Hello!
Where do I get the chrome trim for an 1970 Commando "S" type seat?
I am looking for the wide chrome/rubber strip , chrome strip is about 9-10 mm wide.
So far I only found the narrower variant which is 5-6mm wide.
Uli

Try R K Leighton: http://www.rk-leighton.co.uk/