its becoming unfortunately all too common for many xj40 parts. fair enough if you want new, but you will struggle to get one right now, unless you can find a new/old stock
you best bet is to email, and say you are from this forum!
Jaguar Classic Parts <firstname.lastname@example.org>
we are having regular communication with JCP to request parts that members need. from these request they can build up an idea of what the demand is, and hopefully decide to remanufacture these parts.
there is also a section on the forum dedicated to JCP, where you can request a part, but that way is a little slower.
best to email them directlyhttp://www.xj40.com/viewforum.php?f=62
also, this rings a bell. "i think" this maybe the same as a volvo part.
see here. another avenue you may be able to investigate?http://www.ebay.co.uk/itm/NEW-VOLVO-DRV ... 3f24bbca57