I changed that one Saturday one the 66. I used the one piece replacement from Ground Up.
It fit pretty well and was worth whatever it cost so I did not have to bend line.
It had to go through the opening in the frame at the drivers side in front of the rear wheel to get to the crossmember in front of the rear axle. I might have mis spoke about which crossmember in the earlier post. I did not pay attention when I did it, I just put the new one back where the old one came from. When I got done, it fit into all of the clips on the frame that held the original, and lined up with the opening where the flex hose comes through the crossmember above the rear axle.
The new flex hose was different on the axle end, so I fabbed a bracket to attach to the cover bolt.
I installed the rear first and then carefully bent it enough to fit above the trans crossmember.
Ended up going into the clips pretty well.
Note that I am not doing a resto, I painted it for corrosion protection, scratched the crap out of the paint, and did it on jackstands in the driveway. Took about 1.5 Bud Light Limes.
I will go look when it stops raining.