There are aftermarket ballstuds (Lunsford come to mind) but one thing to watch out for is quality of fit between superficially similar sized parts, the last thing you want is a ballstud that pops off or binds up because it is 0.1mm different to the kit part.
Screws are pretty generic, although there are some specialised screws in kits that you are unlikely to get off the shelf (unusual lengths or partial threads).
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