www.finalfab.com Under products brakes 7 inch dual diaphram booster. That will work if your under a 17 and if not you will have to move all of the brake assy over. Or buy one a new pedal assy. We are starting to RD pedal assy now. I dont have one for the yota but I do for the pathfinder/ hardbody. I can do one for you to if your interested.
I have an early model toyota booster for my 88 toyota. I got is from Seth (twistiedminis.com). I can clear a 20x8 wheel with a 40 offset. I think its from an 83 or so. Not sure
Andy yours is from an 81. But anything from a 79-83 will work as long as its 2WD and not 3/4 ton. And Andy said his bolted right up. I know on the 89-95 body style you have to modify the push rod, and run an earlier master cylinder.