Options for diving doubles

[EberWolf]

I recently picked up a US Divers doubles J-valve solid bar manifold that I'd like to use with my Argonaut Kraken.
The local dive shops here in Bahrain are kinda limited to AL80 and maybe a few steel the same size.

I'm going to be Stateside for a few weeks this month. Either new or used, what size should I look for? Same for the doubles tank band.

Jim