Hi griztkojr
I also could not find a part number for the sunroof slider mechanism peg on the passenger side (the slider mechanism pegs are not shown and not listed in JEPC - Jaguar Electronic Parts Catalog).

Try calling Tom's Foreign Parts here is Connecticut: 1-800-973-5506.
They have many XJ used parts and cars that they are parting out. They have their own website (Quality used car parts - Tom's Foreign Auto Parts) and are also on Ebay with an Ebay storefront.

Also try Sun Roof Doctor on the internet (417)-788-2707
The Sunroof Doctor - Your source for replacement sunroof & t-top parts!

I also could not find these parts where I usually get the part numbers on Gaudin Jaguar (when I can not find them in JEPC) www.gaudinjaguarparts.com

Your best bet is trying some of the online used parts websites. Just give them the description of the parts you need.

Here is a JPEG file showing the sunroof sliding mechanism peg you said that is broken:



Jim Lombardi