I would just search until you find it. It'll probably be in the "brushless" section. Not to sound lazy, but I don't wanna search all night. :)

Basically:

• open the case
• GENTLY seperate the ESC from the case (there are thermal sticky pads)
• remove the heatspreader slab
• clean the FETs and case where the pads were
• cut a piece of 1/8" thick aluminum the same length and width of the old heatspreader (the old one is too thin to do the mod)
• use thermal epoxy (Arctic Alumina adhesive) to secure the heatspreader to the FETs
• let harden
• epoxy the ESC/heatspreader to the ESC
• let harden
• put the case back together.