Get a set for a 5.7L 2500. Don't see why having a straight able would affect headers

 

The solid axle line on the Mega cab and 2500 4wds don't have near the room that the 1/2t and 2wd rigs due to the coil setup and how everything fits; it's not the same.
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the 4wd solid axle fronts have less room with the upright coils and everything that's in there. what will fit the 1500 4x4 and 2500 2x4 will not necessarily fit the 1500 mega and 2500 4x4s, so much that not a single one I can find says it will fit. I think JB has one shorty that might work but wasn't sure if anyone here has successfully found a set.