I'm drawing up the inventories now - the numbers are correct, it's just that the descriptions are inconsistent. I've gone with "Pouch for belt". The one in 5103 one just happens to have a flint blade in it.
No, the flint is part of that other set, is not part of the thing that goes in the belt.. of that I'm sure

EDIT: ok, not THAT OLD. Heather is right - part numbers are correct, and the correct "description" is "Belt piece (to hold flint)"
(Sylvia, can you edit that here and in the PROCESS? Thanks)
Sorry for the confusion. I checked the numbers, not the names

(Pizza here, gotta go - Portugal plays an important game with Denmark now!)