Unique balance 30-D-40

A home owner from USA says:
hi!

I would like to identify which replacement part I need to buy.

There is a roller that is broken - please see pictures.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The Unique balance manufacturer has been out of business for some time now. From your photos, I believe you can use our S390-31 side-load balance, with a spring weight option of 3040. Check that out and let me know if you think it will work.
A quick learner from MONTREAL, CANADA says:
yes it looks like it! Do you know where I could find that piece in Montr
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