I believe KIRK said he is using a clutch and pp [40% xtra clamp] from a 3 litre turbo diesel hilux on his 1ggte.search his posts could garner more info.
That particular clutch is from a KZN165 3.0 Turbo Diesel Hilux, 2000 - 2004.
I have not yet been able to confirm its size and whether it suits any 1G engine, besides which this clutch kit is likely to cost about $400 from Toyota....aftermarket custom heavy duty is your friend....