RTI has a rare bayonet for sale for cheap

[Aragorn243]

Muzzle ring a half inch too high for both Garand and M1917. Too high for Argentine Mauser by 1/4 inch (rough measurements for both). I have the bayonets lying around. Put it on the Ross, half inch too high. Fits an Arisaka perfectly except the lug is too large for the groove, but height and spacing is correct. I don't think Ethiopia had Arisakas but who knows.

On another forum someone suggested a Greek Manlicher but I don't have one of them and it was never confirmed.

They also appear to have sold out of them now. This is the second batch they found as the first was back in 2016. So probably not in huge numbers but several hundred at least.