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Search for 9340011853757 or 9340-01-185-3757, page 255-4, item 55, in the TM 9-2320-280-24P-1. Many others offer, shop around. Fleabay is a good source and they are getting more expensive by the day.
If you are looking for the ballistic windshield, page 226.3, item 36. 2510012892233 or...