The indicator repeater lights in the dash cluster fit into these bulb sockets (if this is what you are looking for then I have two spare ones on this old chassis);
Attachment 26081
These in turn fit into a side mounted metal shrouds which clip into the rear of the dash gauges chassis (no spares for these though, they are so crude you could probably make some yourself);
Attachment 26082
The light then passes through small rectangular cardboard tubes to the green lenses one can see on the front of the gauge cluster.