Hi James,
The manual that I have covers all marks, but the stowage section is pretty basic and seems to cover only the MK2/3 APC in any detail. Given their relatively long service lives and the number of different units that they served with, I would think that there would be many variations on correct stowage.
I'd also like to point out that only the Mk 5 and 6 had the spall liners fitted, and as part of that same upgrade, their rear gun rings and BREN guns were removed, so I've got no stowage fittings for a BREN at all in mine and can only go by documentation and photos I've found on the internet. As an aside, these things were out of service by about the time that I was born, so nothing I say can have much authority
Cheers,
Terry