Hi Jose,
As far as I know the first series Deauville/Longchamp used a rack made by Cam Gear in the UK. It is not one that is used in a period Jaguar/Maserati/ferrari or Jensen.
Cam Gear is part of TRW nowadays as far I know. Maybe there have been posts about the Longchamp rack on this site and, hopefully, some more usefull tips.
Best of luck,
chiel