When I put mine on, I got ~2". That is on a 2000. Different years sit at different heights stock. I'm guessing that they settled ~1/4" after a while.
How much height do you need?
ToyTec
Front Lifts and Coilovers - Toytec Lifts: Toyota Lift Kits: FJ Cruiser Lift Kits, Tacoma Lift Kits, Tundra Lift Kits, 4 Runner Lift Kits, Sequoia Lift Kits, Toyota Truck Lift Kits sells two different top out spacers.
The 1/4" spacer may not need longer studs (mine did not, some studs may be shorter and may need to be replaced) (if there are threads showing after the nuts are tightened then the studs are long enough) (use locktite on the nuts)
The actual spacer thickness is 1/4" (.25"). The Lower control arm is ~14" long (pivot/alignment bolts to the ball joint CL). The shock is inboard by ~6" or 43%. A 1/4" spacer yields .3575 (or 23/64", just shy of 3/8" or .375)
A 3/8" top out spacer will yield .53625, or ~17/32" (just over 1/2 inch)