By accident I've stumbled on the M33 Maxson mount in British service, the twin 0.50" precursor of the quad 0.50"M45 Maxson mount. The M33 was placed on the M13 and M14 half tracks (the latter intended for British service) and the M45 was used on the M16 half tracks. The differences between the M33 and M45 appear to be superficial but I cannot find too much information on the M33 so it's difficult to tell.   Are the Maxson M33 and M45 more or less identical, except for two additional