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Unusual choice of thread title - it looks like your UK registration number?
You don't mention whether you have a coupe or a convertible. The section is supplied as the complete rear wing and called tonneau panel. Here's the RH coupe tonneau P/N and cost from Jaguar Classic Parts:
A used panel salvaged from a specialist Jaguar breaker is going to be a considerable saving.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Canīt help, I am afraid. I have one for my own 2005 XKR, but it is fixed to the car.
These guys may have a used one: xk8 parts
Also Eurojag might be worth a try.
And try doing a search for parts by European Jaguar specialist - I sourced a couple of right hand dip headlamps that way.