Historically, Previous generation 3SGE clutches have been slightly smaller than their equivalent 3SGTE partners, that said, they have not had the standard power figures of a BEAMS engine. Given the 6 speed box in the Altezza is also an "Import" in the Toyota range (ie produced by another company and fitted to a variety of other cars), I'd also consider the input shaft spline may be different too. A decent clutch supplier will be able to answer your questions more effectively, but I would err on the side of caution in regards to fitment.
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