Asics Gel Resolution


the last 3 tennis shoes i've bought have been the Asics Gel Resolution 5 (black/blue). they have always fit perfectly. 2 weeks ago i tried to order another pair online but nobody seems to carry the shoe anymore in the size i need (size 10 men's). so i bought the Asics Gel Resolution 6 instead. i thought they fit in the store but once i started playing in them i noticed that they slipped off the back slightly.

does anyone have any idea where i can get the 5 version??