the tranny I believe takes 3.1 quarts. so buy 4, dont just go with 3. you will need a hand pump to get it in there.
also you can order from here
Red Line MT-85 Transmission Fluid - Now Available at Z1
since you have a bit extra with the drain plug open. squirt a lil bit into the tranny and let it flow out. then close the drain plug and pump away.