Do you have the old one? If not can you access one on another stabilizer?
If you have access, I would take a few measurements. You need to know the diameter and length. Most common style is "Slotted".
I would go to a good old fashion hardware store that has rows of parts bins. You might find it at one of the big national chain stores, but I doubt you will have good luck.
Based on the dimensions, you could go online to McMaster-Carr or even Amazon to order what you need.
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