this is what PA sent me ....
Dave,
It comes down to supply and demand. Right now there is no 2007 Mega Cab 1500 kit because the customer demand hasn't been high enough justify the R&D expense. There is no technical reason for not having a kit available. Nothing on a Ram 1500 Mega Cab is much different than a 2500 series 5.7L equipped Quad Cab. Obviously there might be additional spacers and hardware necessary for the change in cab/bed configurations, but the bumper brackets, steering extension, and other brackets are the same across the two platforms. Unfortunately at this time nothing is available for your specific model year. Right now we don't even offer a regular gas engine equipped 3" block for any Ram 2500/3500 built after 2006. For the 2007 model year we offer nothing that we think would fit out of the box.
The CTD kit is significantly different than the gas motor kit. The radiator and intercooler on the diesel equipped trucks is different and require different brackets. You could make the majority of the PER60193 kit fit your 15000 Mega Cab but you'd end up with quite a few leftover diesel specific parts and you would have to fabricate some of your own. It would be a pretty difficult install unless you've got access to a small fab shop.