I'm certain they're not Celica brakes. I have factory 300mm brakes on my MA71. I just upgraded my Corona brakes (250mm) to Celica brakes. The Celica brakes are 258mm. Nice upgrade
As for the Celsior or whatever... I wasn't ever much of a niche man so I don't know anything about them... but I would be somewhat stunned if they did bolt on.