The 760mm Profile Plus screen for example is adjustable between 724mm and 770mm.
Many screen brochures will give these measurements in the product specs on the back pages.
If your tray is only tiled on two sides, I do admit it is unusual to see a tray buried by 30mm into a wall (normally, I would expect no more than half that). Measure the lip on the front edge, and given that all four sides will be the same, work out how much is hidden.
The 760mm Profile Plus screen for example is adjustable between 724mm and 770mm. Most manufacturers brochures list these adjustments in their product specs pages.
Measure the front lip of the tray, and given that all four sides will be equal, work out how much of the tray is hidden. I must admit I wouldn't normally expect more than 15mm to be covered by tiles. If the tray is in a recess (ie, tiled on three sides), then it's not unusual to see more buried, and the 760mm door replaced with a 700mm model.
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