Yes, 1981-1984 60 Series Fire Extinguisher brackets are ready and live:
you can buy one here. These are for trucks that have the two front seat mounting bolts horizontal from each other.
1985-1987 60 Series bracket protoype should be in my hands next week. These have mounting bolts that are offset in height. I have an appointment to meet a local guy with an FJ62 tomorrow, so I will see if that has different mounting than 81-84 & 85-87, and if so I'll measure it and get a prototype rolling. Like I said above, the design work is minimal - the basic design is the same, I just had to move a single mounting tab (at least on the 85-87). "Redesign" turn around is quick in other words. We'll see what needs to be done on the 62.