Sorry, Beez, I don't have any AK mags left to check/compare with, but my vz-58 magazines are 3 inches deep at their deepest point, 1 inch wide except the baseplate at an inch and a quarter, and measured longest point to longest point, (top rear of feedlip to bottom rear corner of baseplate), is a hair under 9 inches. In the Blackhawk rig I bought, (wish I hadn't), the vz-58 mags barely fit under the velcroed flaps, seen here.
I think yours would be much easier to use, and lighter for us older/fatter guys. Wanna trade?