When we showed our LCD product to HTPC case manufacturers we provide them a guideline of cover window with our retail products, UltraBay which uses the same LCD products. We used half mirror type cover window in front of this LCD and it works nicely and cover the week point of contrast LCD.
As we told you before, we did not provide LCD cover to our ODM/OEM customers and the size of cover comes from different vendor are different. So currently, we cannot give you the answer that you want at this time.
We already notify this kind of issue to our ODM/OEM customers and they may change the cover window later I expect. But they do not talk with us about this issue.