How many different bags did they make?
I am discovering that much to my chagrin, that not all bags are the same.
I say this because I'd imagine that not all bag rods are the same as well.
I purchase an OMC original side bag for my mower (eBay) and was very happy with my deal (the zipper on my old one was rotted) then it became apparent that although it seemed the same, that possibly there were different dimensions. This new bag, when it gets about half full, the weight in it makes it pull away from the chute when I pull the mower backwards.
It is just strange, but it seems that I may need to adjust my arm to make this new bag work with this mower/chute/bag setup.