Chris,
Were you able to find the information you wanted? As others have posted, each AGMA company has it's own individual contract with AGMA. In my company, the dancers are AGMA but Stage Management is not - so my rate is not listed. Unlike AEA general contracts (like the LoRT), there isn't a nation-wide standard, however, you will see several contracts with copy/paste language. This can be due to a particular Union Business Rep encouraging similar contract language with the companies they negotiate with - which may lead one to believe that there is an AGMA union standard.