I got my adapter base kits from a Canadian Supplier ( The Great Canadian Expedition Company http://www.gcec.info/products.asp?cat=36&pg=2
), but I'm sure that 2012Marine (http://www.2012marinerestoration.com/
) who has posted here can supply with them in the UK with a special RIB.netter discount.
The part # for the Adapter Base Kit is 05381. I paid $ 22.42 CAN for each from my supplier I (would guess it might work out to a bit more in Britain since it is a Canadian manufacturer).
As for the other fittings, I picked them up at a local boat shop & and a department store (Canadian Tire) that handles automotive & marine supplies. You could also probably get all of these brass fittings at a local machine supply shop that deals with hydraulic & pneumatic machine parts. Here is more detail on each of the items;
A) The barbed fuel hose fitting on the underside of the cap shown in the 3rd picture is this;
These companies offer barbs for fuel hose diameters from 1/4", 5/16", 3/8". I'm using a 5/16" inch marine fuel hose for the pickup line going into the MFC.
B) The elbow coming from the top of the cap is;
C) Screwed into that elbow is a Chrysler/Force fuel coupler for the simple reason that I prefer that style to to the double prong or bayonet style fuel couplers. I believe that both Tohatsu/Nissan and Suzuki use a very similar style of coupler. Of course you can fit whatever style you prefer.
D) At the fuel line is the female counterpart of the preferred style of fuel coupler - in this case, Chrysler/Force.
E) In the other hole of the cap is a simple end plug since I can vent the tank by slightly loosening the cap. I'll probably replace this plug with some type of ball valve with a breather valve.
Here is a link to all sorts of brass fittings: