[Bruce Parker (RIP)]

We are trying to determine if Darrell's carrier is a Mk.I, a Mk.II or a Mk.II*

We are determining if his 19 set is a Mk.II or a Mk.III


...and...

...whether a Wireless Carrier No.1 or a Wireless Carrier No.2 would be the correct installation of what may be a Mk.II or Mk.III 19 set in his Mk.I, Mk.II or Mk.II* Carrier?

(so what's so bad about the American way of calling everything M-This or M-That?)

To confirm, Darrell's 19 set is a Mk.III Canadian one. The Carrier appears to be a Mk.1*, but I'd want to check the holes in the armour Stew identified. If they are open or filled with nuts and bolts (i.e. there was originally something mounted there), it's a Mk.1*. If the holes have been factory filled with rivets, it is a Mk.II (not Mk.II*) that was originally a mortar carrier.

Now, will it sport a Mk.I, Mk.IM or Mk.II Bren gun?