Gun Parts Corp (aka Numrich) (www.e-GunParts.com
) seems to likely have it.
If you can't find an original factory part (which may fall out like the original likey did) you can likely make one from the shank of some size wire gauge or metric twist drill; assuming you have some gun-smithing and or metal working experience. Also, you may be able to find a "roll pin" of suitable diameter and length to work. .