Could some one tell what size rivet snaps I need for the rivets of the 25 Pounder & 25 Pdr Ammunition Limber

Since rivet snaps are not available in France I'll have to order them from the UK. Brexit makes ordering from the UK difficult, so I don't want to make any size mistake in the ordering. I know I can get them from Polly Model Engineering in sizes going from 1/32" to 1/4". The question is what size do I need?
I've read all the forum comments on rivet snaps but as to the size need for the 25 Pounder & 25 Pdr Ammunition Limber I'm left with some doubts.
Richard
Edited on Friday, 27 January 2023 at 19:17 (GMT + 1) à Paris, France;
sent later.