I preordered a pair too on the understanding that they would be as the OP expected and I'm disappointed that DMGRS think it acceptable to mix and match as they see fit. I am not at all happy about this more so given that a welding difference was mentioned in the email and that the Indian arms are known to be poor and possibly not safe with respect to this. Hmm?
Edit: I too have asked for both arms to be SAIC.