Thought about some LED's may end up going that route anyway.
However did some brain melting and I vaguely remember how the old ones fit. Basically the rubber grommet held the bulb. The socket had the wires in it both of them.
So went out to my close parts yard, aka my trailer in my back yard. Pulled out a set of gauges that I bought from M.A.P.I., Paul you may remember them, they are still in the box and the box is very faded from being carried around for about 30 yrs. Pulled the light bulbs out of them and they fit in the hole. The sockets from a set of auto gauge gauges that I had work on the bulbs so wala I have lighted gauges.
Didn't take any pictures however.