Some pics of what Ebro wired up as indicators. On Ebro tractors these mount in the Dexta position, but Billy has them as side/rear lights in the usual position. Although they're quite different from the Butlers side lights, they're clearly based on them (the rim is almost identical, the lens is pretty similar too, and they fit the holes for Butlers lights in the mudguards). Note Billy's ones have the lenses transposed to keep the lights reasonably level.
Sandy