I bought one once which I think was a Clutch Industries one for $200. It did the job and the price was excellent. I don't own the truck anymore so I don't know how long it will last.
I think a genuine one was about $280 at the time.
while they are doing the rear engine seal, get them to check/replace welch plugs on the back of the engine, inside the bellhousing (gearbox shroud from engine). this may save leaky coolant fluid later on. i just had my clutch done too. $600 for the exedy (aka. Daikin) safari, with around $600 for labour, and new PBR master cyl and slave cyls $280...i think. all up, just shy of $1500...WELL worth it, it drives sooo sweetly now!!!
I fitted the PBR 4Terrain kit in mine very happy with it cost $440.00 for the kit. That includes throw out race clutch and pressure plate.
The flywheel resurface was $80. Fitted new spigot bearing cannot remember how much and all new welsh plugs at back of motor, I forgot to do oil seal but it hasn't leaked yet but I would advise to do it.
I also fitted new slave cylinder but used original master cylinder.