I didn't realise that they'd lasted that long in Oz. All the Infantry Companies had them in Malaya for jungle warfare as the M60 and GPMG/L7 belts made movement really difficult. You could sort-of fit a 44 pattern water bottle pouch onto the L7 to take a 60 round belt but you culdn't do the same to the M60's.
Yep, the Bren was certainly the thing for the jungle