Intended for use with the Airfix Stalwart Mk.2. 
Options include initial bolted or later sealed windows (mostly), trim vane up or down, left or right parking main wiper, seats up or down, fitting of third cab seat, advice on cargo strengthening bars and fitting for radio (FFR).
The set includes a one piece cab with an all-new interior, 3D parts to replace the cab grilles, exhaust grille, water jets, headlight brushguards, wipers, mirrors, plus winch cable and PE detailing. Wheels SMM3570W and tilt SMM3570B are available separately.
 
The Stalwart was a front-supply High-Mobility Load Carrier, an off-road truck that could follow and reach tanks and artillery units – capable of negotiating knife edges and the like, unlike normal trucks. They saw British Army service from 1963 (the Mk.1) until 1993. The role of the Stalwart was to get supplies to front-line units, usually in the dark. The swimming role of the Stalwart was only in case a bridge was not available. Swimming was not the primary role of the vehicle. 
Stalwart Mk.2 is easily distinguishable from Mk.1 by the large tear-drop corner windows of the cab, introduced for increased driver visibility. Mk.1 and early Mk.2s (ER vehicle registrations numbers) had bolted windows all round. Later Mk.2s (ET VRNs) had rubber-sealed windows (no bolts) – but the rear side windows stayed bolted as they were used as escape windows that could be slid down – as per the Airfix kit.
ER VRNs predominantly had the cargo sideboard strengthening bar two corrugations up from the bottom. 
ET VRNs predominantly had the cargo sideboard strengthening bar higher up the side, with two small vertical bars connecting it to the top of the sideboard – as depicted in the Airfix kit.
In later life, from about 1982, the amphibious role was abandoned due to modern bridging technology. Water jets and trim vanes were removed from many vehicles, but not all.
Most Mk.2s with ER VRNs did NOT carry radios due to carrying fuel and ammunition, but did have two round aerial blanking plates on the roof. All Mk.2s with ET VRNs were fitted for radio (FFR), but not usually equipped. If not radio-equipped, this left an empty space on the right of the cab, other than battery box mounting supports bolted to the cab floor. This was a good location to put the driver’s 58 Pattern Backpack. Nothing else. A third seat was only introduced to British Stalwarts when the two crane versions (FV623 and 624) entered service from 1969. Stalwart was replaced by the Leyland DAF 8x6 D.R.O.P.S. vehicle.