they are harder to find than the truck axles which are becoming harder as well.
diamond axles is another option as well but they look pricey.
theres another company i dont like mentioning on here that makes rock assault axles.
ruff stuff is another option.
since you got the 40 axles floating around that might be yer best bet. not sure about width though.
RUGER 
there a few inches shorter than the pu axles, but im pretty sure you can run the ifs hubs and get the 3 inches like the pu axles. it will be a little harder finding the parts for it since its just the housing and a 9.5 in diff and not a 8 in from what ive seen
