Hi,
Here’s a link to just one [https://www.digikey.com.au/en/product-highlight/k/keystone/snap-on-aa-and-aaa-battery-contacts|supplier] of AA battery connector parts. There are others e.g. mouser.com, farnell.com etc.
Alternatively you could search for ''AA battery holder'' and scavenge the required parts from the holder.
You probably don’t need this but here’s a link to the [guide|59579] guide which may help in gaining access to the terminals in the battery holder.