Replacing a ceiling light fixture, I found a wire adapter
I would cut the existing ends off and use wire nuts to make the connection. Just about every hardware store will have wire nuts and even some grocery store’s have small bags. Cut the wires off strip the insulation and twist the nut on and it is done in seconds. 
Added

I have not seen adapters for these styles of plugs usually you have to find the right style , cut the wrong one off crimp the ends then insert them into the new shell , so you can see wire nuts would be much easier and quicker.