December 2018 issue of Wargames Illustrated with the Cruel Seas "Boat" Sprue

Sequence of actions: Big kid enters candy store, sees best candy ever, buys one (restrains himself from buying two but then orders the bigger "pre-order" Starter Set) and takes it home and immediately starts eating or rather making it (see below, the "candy" bar):

Said "big kid" puts together the "candy" and is one happy big kid [albeit no longer in the "candy shop"] knowing that at least the "candy" has been assembled is ready for the 'painting tray' (see below, or on closer inspection are they ready .. drum roll?):

I have a piece left over and it does not seem to go obviously anywhere! Have I missed a bit of a gun somewhere? It seemed to be parked where all the other gun bits were, but I don't want to go just sticking a bit on any old thing! Dilemma! (see below, middle left hand side - the mystery piece):

I did a Warlord Games S-Boat Google search but all the images seem to look like the S-Boats or E-Boats (take your pick) I have assembled. Sadly the "sprue" was considered so straightforward it came without instructions ... argh. Any help appreciated (and thanks in advance) .. they may be crew seats!

PS: I also notice that the "sprues" were a mixture of RN Vospers and KM E-Boats. They seem to be selling really fast! In fact no RN Vospers were left by the time I picked up my copy.