CC fuel/def filler neck questions

[GroundSquirrel]

Can anyone verify that a CC def fill neck has the same lower connections as a def fill neck from a regular 2500/3500?

 

[AH64ID]

The tanks are different, but that’s all I know.

 

[GroundSquirrel]

Well I guess I can transfer the lines to the CC def fill neck if needed.

I'm building a flatbed for my 2016 3500 SRW and I'm just about to the point of fabbing up the mounts for the fuel/def fill necks. I want the CC necks because of the screw on caps. I've tried a few different caps for the capless system and I don't like any of them.