I found these sites doing a Google search for 'XJS fog lamp parts' - maybe one of them can help, there were dozens more! Good Luck!

http://www.jag-lovers.org/HyperNews/get/jagswap.html
http://www.importpartsspec.com/jaglamp.htm
http://www.welshent.com/xjs/xjsparts.asp?part=Electrical

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E