I ran into the same problem, it appears that suppliers of these parts in the US are all receiving the same part made in Taiwan and it is made incorrectly. I did find a metal window belt line which is very close to original with Rubber Made the right way, their catalog number for the kit is 10-248X, runs about $40.00. It is made in USA by a company called Precision their number is WFK1110 60A.
https://search.rubbertherightway.com...id=3&q=10-248x
You can see the issue in the picture, it is the placement of the mounting pins, on the repo they are in the middle which lowers the piece, originals are at bottom which raises it so channel doesn't hit window riser channel.