Whilst I don't know the numbers of the switches they are the same as the Jensen interceptor Mk III although the labelling may be different. I have tried Bristol Cars in the past but even without their current troubles they were not able to help. Suggest you ask in the Jensen Owners' Club forum
https://www.joc.org.uk/forum/index.php which is free to access. There you will see various suppliers referred to like Appleyard (0115-932-5320) or Rejen etc who may be able to help.