This is true.
You have 2 options if you really dont fit, either get a non-GT seat (non leather) as they are lower than the GT, or get an aftermarket which is lower again.
In terms of aftermarket options, Recaro are a good choice (one that I made) and you can run these with Bride rails and make an excellent option altough more expensive than non-GT seats I would imagine (if you can find someone to swap with you).
Make sure first that you adjust the seat adjusters all the way down as this will help. Aftermarket seats will be a good few inches lower though.