I haven't seen any kits as such.
Best to just order a new extractor, extractor spring and plunger, ejector and ejector spring, AND A BOLT TOOL.
I recommend buying the parts from someone like Fulton Armory, Orion 7, or another source of genuine USGI new parts.
BUY A BOLT TOOL.
While you "can" dissemble and reassemble the Carbine bolt without the tool you 'llreally, really, really wish you'd bought the tool.
Also note, while the Carbine bolt looks like a smaller M1 Rifle bolt it isn't.
Attempt to disassemble or reassemble the Carbine bolt like an M1 Rifle bolt and you'll ruin the extractor and plunger.