Thanks for all the information people.
Am I right in thinking that the Soviet Y harness normally has 2x double mag pouches attached to the belt?
Also, for those who've never seen this before, it appears that when the Soviets were in Afghanistan some soldiers improvised their own webbing using 2x RD-54 pouches and I assume that this "webbing" can carry 4 mags (2 in each pouch) but does anyone know if that is correct?