343 was a Shell tank wagon purchased from the Swilly in 1954 as a chassis The tank being owned by Shell as is usual didn't form part of the deal.The same setup is shown in"County Donegal Remembered" p130,in much better condition supposedly Sept 1960 though i have my doubts.oddly A2103 is lettered up as Shell I wonder if that is all to do with the joint trading agreement between Shell and BP at the time and as the tank wasn,t big enough to have both companies on each side they each had their own side.Food for thought.Andy