I have purchased a fisherpaykel 76cm built-in-ovens/OB76SDEPX2. It appears that the cutout is too small to fit the oven flush but it does fit sitting out. Can you tell me if there are 2 different size cutout a for proud and flush or is it just a matter if changing the bottom piece. We specifically had the cabinet built so it would fit flush and it doesn't seem as though it would fit in any further because of the height. Thank you