OK, as it turns out, doing this you end up with cross bars that are 38 1/2" long. If you plan on using it to mount a rack, don't buy a rack that is exactly 38 1/2" wide at the support tubing. Can you believe the luck? My cage rides right exactly perfectly centered on the rounded corners of the cross bars. This is no good at all.
So, if anyone is wanting to do this mod, all you need are the 94 roof rails. 25.00 plus shipping, to recover my cost, and the shortened bars are yours. I'll give you my time. Just be sure to buy a rack that is 36" or less wide .