Most Bunnings outlets carry a range of suitable springs, they are in the cabinetry section, look for a rack of yellow and white plastic bags with springs in them. Take one of your originals in to compare with what is available. It doesn't matter if you think a particular spring is too long, as they can easily be cut down. Just get the right compression resistance, diametre, etc.
BTW, I used to own a 12" GSO dob and Bunnings supplied my spring upgrade. Cost only a few dollars.
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