@etienne1201 Etienne sorry about that fella if it helps you there is an isF that used to belong to a member that was rolled on the motorway a short time back but the car itself is intact as such so there is a very real possibility the box is fine.
Ive rang the dismantling people where the car is if this is an option for you they are looking for £1750.00 for the gearbox that's about €2000.00, the guy to speak to there is Bill who deals with the Lexus side of things, the link to the company is below.
http://www.lexusbreakers.co.uk/
There are photographs of the car on the site, I know of this car and pre crash condition was fantastic.
There are pre accident pictures on the forum of the car and a video as well.
Good luck with sorting it fella.
Big Rat