Hello! The design and size of your glazing bead very closely matches our 55-006. This may be what you need, but review its dimensions and see what you think.
This product is sold in 3' lengths, but we also have the 55-006-6, which is the same product but cut in 6' lengths. All orders can be placed directly on our site at your convenience.
I think I see what you mean. We don't have anything made that way, unfortunately, but to be honest I think that's just the result of your original shape being compressed from what it was originally. You could get the same step down by pushing on the long leg of the 55-006, and after so many years stuck in the same position, it would probably get stuck that way. That's a pretty common occurrence for older glazing bead.