Had a reply from North Oxford Motorrad.
Unfortunately, they don’t have any in stock. So it looks like I’m going to have to rely on e bay or hopefully someone here may find one laying around or tucked away somewhere.
I do have one for a k1200s, but as I’ve gone up to a 55 profile rear tyre, I now need one for the k1300 or find an engineer type of person that could modify mine… 🤞