Don't recall the manufacturer, but I found some 3D print stuff for Vietnam, Chinook helicopter, and they had some shells and such which might pass muster for on the ground - don't know that they'd sling well under an aircraft but I'd bet someone has what you are looking for as a 3D print. Just might take a couple hours of searching.
The whole 3D world could really use some sort of better sort mechanism for finding things. Right now, at least for me, it is always a crap shoot.