I will add to websites here that, between the two of them, have an enormous amount of a/c information. In addition to the refrigerant capacities as found in Mikes website, they have oil capacities for systems, r12 to r134 capacity differences and lots of other good info. I'm not trying to upstand Mikes website, but merely trying to make even more information available.
Hope this helps.
aircondition.com and acsource.com are the two sites.
Have a great day,