18 Pdr Limber ( Aust )

[Graeme Stephens]

Greetings from Perth, West Aust. - I have come back to an 'old' restoration of mine, with the hope of adding some of the 'missing' items.
Hopefully the International Brains Trust can guide me, briefly the Aust Army at the start of ww2 had 2 types of 'pneumatised' 18pdr Limbers, ones with the Firing Platform frame on top / and ones without.
The pic'd Limber is framed.
From what I've seen on wrecks over the years the framed limber had Tools mounted on the old Foot Boards, while the frameless Limbers retained the Rifle mounts at the front having easier access - but field mods are common ?
My first question - on top at the rear is a bracket array, which I'm guessing holds 4 Aiming ( folding? ) Posts, I have a spare 3" Mortar post but it is too short. !8 Pdr aiming posts in manuals are mentioned but I have not seen one.
Question 2 - I'd like to make leather pouches for the Fuse Setting Key No 17,18,19? they were mounted on each side, does any one have dimensions of the Key. .................. there's a start ....... cheers