I have never seen a single fiiment bulb with offset pins. I see no use to do that. I am using a LED in my Town Sedan, burned my fingers one to many times using an regular bulb!
The early type base wasn't really made to be taken apart since a little metal bent tab has to be straitened to disassemble. If the tab breaks off then the housing is done.
Several comments about using an LED Bulb for the Dash Light BUT no one has offered the type or number ! Can someone help ?