Will these work for the cupholder/ashtray?

 

I dunno. I think mine has three screws. I just didn't feel like taking it apart. You have to squeeze this little silver metal holder, then pull the bulb out once you get the cover off. I left the plastic (it's blue, btw) in, simply so it matched the instruments.
In theory. Only issue it will have is fitment into the silver housing.

 

Mine is kinda a blue/green color. I wonder how the fitment will be...hmmm

 

i have LED i my tail lights and my park lights all i did was replace my flasher with a heavy duty flasher from AuotZone n they blink just like they sould i have LEDs in my chevy, ford and dodge and i never put load resistors on any of them