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This is a four pack of 2mm:1ft scale BR 16T mineral wagons, two to diagram 1/105 and two to 1/109, and of each pair, one has the fabricated end door and the other the pressed end door. The only difference between the 105s and 109s is that the 105s have the outline of the bottom discharge doors marked out in the floor; the 109s are like my other model of these EXCEPT THAT none of the wagons in this set of 4 has the tracing on the underside of the floor for locating on the modified Peco 9ft wb steel solebar chassis kit. Why? The tracing is no good if you want to use etched chassis kits and is fiddly to remove, especially if you care about the projecting ends of all those stanchions. You will also notice that this set has four "spares" of the opening ends, so you can replace this part on other models (mine or others'). Please note that Frosted Ultra and Extreme Detail plastics don’t bond well with some glues, even when cleaned properly first (essential). Hopefully it should stay together well enough after painting over the joins. If you just want the actual door part and not the ribbed top above it, you should (with care) be able to cut off the top bit, which I have included in case you break the corresponding part on the model you want to fit it to. The "spares" are thickened by 0.05 mm compared to those on the full bodies as a precaution for printability and handling strength. Like the scores in the floors for the bottom discharge doors (for the 105s) I doubt anyone will notice this.
Update about glues: actually, it turns out that Deluxe Super’phatic works pretty well, and there may be others.