I thought I'd put this link to this pdf below to help everyone considering brake conversions, see differences between disks sizes and offset for different gens.

This may clarify a few q's

Scroll down to the celica section on page two

Brake Rotor Specs

Unfortunately as its Australian it only has Gt specs listed.

Scroll down to the celica section on page two

find a parts store with a brembo dealer catalog...they'll give u lots of info