70 Swinger Dash lights

I think you will find the turn indicator bulbs in this dash most difficult to get a hand on. Column support in the way.
I would just go ahead and pull the panel to change all those bulbs to LED too. If 1 or 2 are burned out, the others may be going soon. Install a solid state IVR, clean and tighten connections, etc.., while you have it out.
If you had a/c you would easier pull the glove box to get to the signal flasher.