I can't find any mention of the GMA on the KA site, only the KGM. It is also lighter than the KGM.
Sorry, no help.
I noticed that the KGM has the KA logo on it. I would go for that one. Even though the GMA says it is for all KA mixers, I would be hesitant to use it. If it damages your KA, it could void any warrantee you may still have.
Illegitimi non carborundum!
I don't want my last words to be, "I wish I had spent more time doing housework"