So, it seems that they sewed the seams? LolTrying to bend the new ones is likely going to destroy them. To do the twist, it would seem you would need a press brake to do it correctly as it is on an angle.
The new casing seems to be two parts that were sonic welded or glued together over the anchor and operating mechanism.
The factory ones seem to be a complete case with no seams.
Thanks for finding that. I am getting a set that I can restore.From the service manual. It appears buckets and bench use the same outer front belt.