There are no great manual pedal solutions available for the xjs. I had to make my own and this may be of interest to someone else. This is going in a late face lift XJS with the 6.0 v12.

 

In the UK, manual Pedal boxes do come up for sale - mostly for non-ABS cars & the asking price is usually about £350

I can't remember when I last saw an ABS manual Pedal box for sale in the UK - in the USA they really must be as rare as hen's teeth.