smaller master cylinder 99 s10

I saw a feature (i think) in Mini Truckin (i think) a couple of months ago where a dude got a much smaller master cylinder for his s10. Does anyone remember what month that was or where he said he got it or where i could get one? Also, does anyone know how many tubes or whatever are in the evaporator? I'm wanting to lay with 20's and i need to cut down my a/c box, and i've never messed with one so i don't want to cut through something important. Please help.

look in jegs.there is a smaller master cylinder and booster for i believe $250.and the ac box question remove and also in jegs there is a heater/fan that mounts under or behind your dash pretty easily.its like $150.good luck.

7 INCH DUAL DIAPHRAM HOT ROD BOOSTER AN MASTER CHECK THE HOT ROD MAGS AN MUSCLE CARS YOULL FIND IT OR EVEN EBAY MANG!