290P83HN02 crystal thickness - 3mm?, 2.5mm??

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Hi,
I am seeking for a sapphire to my SBCM023 HAQ. Usual suspects/suppliers of aftermarket parts do not have a direct replacement so I need to find a way to the correct sizes.
It was easy to learn that factory 290P83HN02 crystal has 29mm in diameter, but thickness is a question mark.
Anyone knows do Seiko hardlexes all are 3mm thick by default (no matter the size)?, or anyone knows the thickness of this particular glass?
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