Hi Martin,
I got five of the Jaegar dash instruement bulb holders from Andy Burnett a few weeks ago. He says if you would like to contact him sheilandyb@gmail.com he will see if he has any more. Please note that he only has the ‘thimbles’ into which the little 2.2watt bulbs screw not the ‘button’ contacts for the end of the bulbs with the feed wire. These are easy enough to make yourself.
Good Luck
Bob Cross