No, they don't sell the replacements of the standard Gulikit control stick module separately. I can only guess it's to bolster the Gulikit KingKong controllers relative to other options on the market assuming the stick can be fitted without secondary boards or the like on competitor options.
Gulikit does sell Steam Deck replacement modules, which are attached to a board. These can be found on various online storefronts. If these are of the same sort found in your own Kingkong, you might be able to desolder them from their boards to install on your controller. Just a hunch. Also, Gulikit's replacements are relatively costly as of now. Weigh the value of these replacement components and related equipment to the cost of your controller when making a purchasing decision.
I hope this expands your options.
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