Markings on Magazine Boxes for Post 64 Rifles

Hi there,
Does anyone know what the calibre the markings on the magazine boxes correspond to? For example I have seen A, B, K, KFC and M which I know is for magnum?
Does anyone have a reference of all the codes used?
I'm in Australia and it's very hard to get Win 70/670 parts especially magazine boxes and floorplates. I'm looking at customising my two Win 670s to fit on the floorplate model stocks but do you think I can find them or get the guys in the US to post them to me.
If someone can help me out to locate some parts for Win 70/670 long actions models from 1968 onwards it would be most appreciated.
Cheers
Jorge
Does anyone know what the calibre the markings on the magazine boxes correspond to? For example I have seen A, B, K, KFC and M which I know is for magnum?
Does anyone have a reference of all the codes used?
I'm in Australia and it's very hard to get Win 70/670 parts especially magazine boxes and floorplates. I'm looking at customising my two Win 670s to fit on the floorplate model stocks but do you think I can find them or get the guys in the US to post them to me.
If someone can help me out to locate some parts for Win 70/670 long actions models from 1968 onwards it would be most appreciated.
Cheers
Jorge