LOL the IMA repops don't fit either a 1942 Lithgow or 1918 Erith.Yes, Mike is correct. These look like the ones from the great auction battle between two forum members last month (went through two bags of popcorn)!
The two shiny ones are IMA reproductions, the third one is a collection of pieces and I think was incomplete. The piece marked MA is Australian WW2 Vickers 303 MG Brass Condensor Hose Fitting Part | eBay
and I think some of the other parts were reproduction parts.