Our 19' Bambi is newer; but three years ago, we replaced all INTERIOR incandescent bulbs with the LEDs listed in the link, below.
Note: These LEDs are direct replacements for incandescent bulbs. However, they will NOT work with fixtures that have two hot leads (e.g., running light AND brake light in same bulb), which have two center connectors instead of one. If those are needed, I'm sure the vendor has those, also.
So far, absolutely no LED failures or problems.