I have set of Toyota Aurion Sportivo wheels which i would like to fit to my Second or Third Gen.

They are 17x7, 5x114.3 ans Offset of +45.

Will these fit ?

yepp!

Stock wheels are 17x7, 5x114.3 and +46 offset. So they're good to go! For legality's sake I would double check that the tyres are sufficiently load rated.

haven't put tyres on yet as they were pretty banged up so i have prepped them and sandblasting them before sending them off to be powdercoated first

What about the centre hole sizes?

no idea, good question

Magna is 67.1, i'd be surprised if the aurion was less but do a google search on it.

Magna is 67.1, i'd be surprised if the aurion was less
My thoughts exactly.

I'll try a wheel on before i send it off to be powdercoated just to be sure