[Michael R.]

Are they the larger ammunition bins, TL 13065? Your estimate of 8x10 inch suggests they are. John, what is the part number punched into the side? The retaining clips are missing from the engine facing side. The clips held the spares wallet for the BREN. See Jordan B., who recently installed one. There should be a packing board between the bin and the mudguard. That will explain the rather longish 1/4 inch flat head countersunk retaining screws. The images from Steve Tegner in J'burg, RSA show the spacer in place on the museum MK-I*.

If it is the (much) smaller bin, as Richie and Lynn say to hold the radio spare tubes box, it should also have the clips on the front to hold the radio spares fuze box. A search of the assembly number in the parts manual will reveal the bin number. I will post an image or two. Bruce P likely has images of both with the spares cases in place.