bulletTorx T50 "bit"
bullet(for 91 power seats, anyway - other seats may use a different size)
bulletI've heard T35 and T40, so check yours to be sure - most likely, you'll have to buy a set anyway to cover any of these sizes, and it's good to have a set of Torx bits, as they're being used more and more
bulletTorx T10 and T25 bits (included in the Saab tool kit)
bulletFor removing plastic trim panels from power seats
bullet3/8" drive ratchet
bulletDesirable: 3/8" x 12" breaker bar, to break bolts loose
bulletAlso easier to get into cramped spaces
bulletTorx T40 bit or 17mm socket
bulletFor removing seat belt anchor
bulletDesirable: ohm meter, to measure heater and thermister resistance
bulletA test light or buzzer should do for the heater element check
bulletIt's probably not necessary to check the thermister
bulletUtility knife
bulletSoldering iron and electronics-grade solder
bulletCoat hanger
bulletDesirable: Common, needle nose and diagonal cutter pliers