Made a few phonecalls, heres what Yukon says:
For reference here are some part numbers:
#YA T35350 is Yukons 1541H shaft, 29.25" long
#YAW T8-30-29.0 is Yukons 4340 Chromoly shaft, 29.125" long
#AXT34060 is Nitro's 4140 Chromoly shaft, 32.125" long (cut to length), made in USA.
Im going to...