1950s How to change clock lights/instrument lights

[Daffer]

I've been on a mission lately to replace all the bulbs in my 1950 cadillac as most are burt out. I've recently moved from changing my map lights to now my instrument lights but I'm wondering are the instrument light sockets held in the same way as the map lights with springy steel tabs? My second question is since most of the lights are burt out I'm going off of photos but how many bulbs are there in the instrument panel, I know of the 2 in the clock but what other ones? Thanks, Joshua