You could try Rally Design in Kent ...

RD9605 - Bottom Spring Seat
RD9606 - Locking Ring

Both for Bilstein Struts

www.raldes.co.uk
www.rallydesign.co.uk

01795 531871

Rally Design
Units 8 - 10 North Quay
Upper Brents Industrial Estate
Faversham
Kent, UK
ME13 7DZ

Hope this helps

G