The first row of the permanent seats is A. The double-letter rows are the pull-out sections below the permanent rows and go in reverse letter order. Past BIGs at the BJC, they didn't pull them out, so the first available row was A.
Still only $3 each in 2005. The same price they were ten years earlier when I first bought mine. So cheap, I kept renewing even if I could only make half the home duals.