This is
Dorman Products Window Lift Parts Lookup. It shows only 74409 and 747-409 as Gear/Plug kits and 74410 as Plug Kit. The "years" they show include when your motor was made.
EDIT: This link displays other window parts. Use the menu on the left edge to get to Gear Kits and Plug Kits.
I've never fixed one with a "kit." First one I did, I stacked two 1/4" hex nuts (7/16" wrench size) in each "pocket" formed in the gear area when the damaged pieces came out. I kinda sorta wonder if your motor started out with more in there and somebody cleaned it out misunderstanding what the problem was.
Be sure the steps move freely now that you have the motor off. I suppose it's possible for the steps themselves to bind where they link together to extend and fold. But I found most of our binding was in the motor area. I remember a spot that was a little lever with a ball-and-socket-looking joint. IT was the cause of our step creaking and groaning, and not fully retracting.
Not sure aluminum can material will handle the strain. Your pix look different than my memory of the gears I've fixed. Mine were from the days of the earlier round motors and I haven't had any of what I call the "Square" ones apart. If all you need is a metal strip, what about part of a stainless steel hose clamp...
