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This is a pair of bogies designed to be just right for my N-gauge/2mm WD (WW1&2) Rectank, which could be fitted using the retaining posts which would otherwise be suitable for use with the "cut down" Graham Farish diamond frame bogies. If you prefer the retaining posts designed to suit the N-gauge Society bogies, search again and you should find that version too. You will need to decide whether to use the self-acting N-gauge couplers, or fit NEM couplers in the pockets provided at the other end, and you will need to cut off the ones you don't want so that there is clearance between the bogies under the wagon. The correct wheels would be 8-straight-spoke 5.5mm diameter, but 6mm should still clear the underside most of the time. Parkside Dundas 5.5 mm curve spoke will probably look OK too, and also run nicely. My 5.5mm 8-straight-spoke 3D printed wheels are another option, but being light and a bit short on flange they don't run as reliably. Finescale 2mm wheels on 14.8mm axles should also be OK.