I have a 2005 Crossfire Limited. The rear cargo light went out and I needed a new bulb. Every auto part store and also this forum says it takes a 6418 bulb. The problem is, it is too short and won't fit between the metal contacts. It just falls through. They can't be bent far enough to make it work. I did find a bulb (6411) that is the same size as the one that bunt out. It fits perfectly but it is a 10amp bulb while the 6418 is a 5 amp bulb. My dash light won't go out with this bulb and I'm wondering if it has to do with the different amperage. I checked every other bub everywhere on the car and can't find any other burnt out bulbs. I mean everywhere. Any suggestions? The 6418 bulb that is called for will not fit!

 

Did you check the small driving lights at the top of the headlight assemblies? If you can, post a photo of your cargo bulb fixture.

 

I went through this problem myself a while ago when converting to LEDs.
The 6418 bulb is 36mm which is to short. The 6451 or 578 LED is 41 - 42mm and is the size that fits.

I think this is what you're looking for. I have this in the trunk of my roadster:

 

I changed mine to led and added another light assembly on the other size , which in 2018 was still available at Chrysler parts

 

Yes I checked those two bulbs by the headlights. I had to replace one a while back and it wasn't fun. They are both working thank goodness.

 

When I changed my bulbs to LEDs I found that some bulbs are more Mercedes size than Chrysler size. They are bigger I believe someone listed the size. This is the one I used:39MM DE3425 6461 LED Dome Map Courtesy Trunk Light Bulb, 2 Bulbs × 1