hardest RUBBER tires for drifting????

[94exa2]

hey everybody, i was just wondering where to get like 50*/60* rubber tires from? anyone know? I just bought some alloy ridgless rims and gpm drift tires(narrow front, wide rear) thinking that the nubs on the gpm tires would be the grippiest drft tires around, but they dont have enough traction for me!
i started off drifting my xmod using some random hard rubber tires that came in a revell civic MODEL kit, and they were PERFECT for drifting. but they wore down badly after months of drifting.
basically i was looking for HARD rubber tires to drift with but only came up with a few 30* and 35* tires and think i want some harder, any1 know where to gey any?

thanx guys, and sry for the long post...