Hey sorry I missed your thread, don't have time to log on much anymore. Big brake upgrade is definitely worth it, and you can get all the parts at Lordco. Just pick a year (1993-1997) and ask for rotors and calipers. Get 100 series (1998) pads, and they fit with no modification. (More surface area than 80 series pads.) All the parts are same JDM as USDM. With the big brakes you will need to ditch the rotor backing plates, which most people agree is fine, as gravel could get stuck in there anyway. If you really care you could buy the larger backing plates from a Toyota dealer, but they are expensive.
Lordco can get oil filters for the 1HD-T too, just ask them to cross reference Wix 57254. Air filter is the same for all Land Cruisers ever, I think. Gas, diesel, 60 series, 70 series, 80 series, all the same. Fuel filter... probably have to get from Radd or Rocky Mountain.
And if you don't already know, Lordco will rape you on price unless you know somebody with an account. Alternatively, you can register for your own cash account and get a small discount. But still probably cheaper than a "specialty shop."