Escam Brick QD900

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Hi everyone can anybody help with a replacement lens for my Escam Brick QD900. It comes with a 3.6mm lens

[TABLE="width: 0"]
[TR]
[TD="class: xl74, colspan: 2"]Image Sensor[/TD]
[TD="class: xl65, colspan: 3"]1/2.5” Megapixel progressive scan MT9P006 CMOS[/TD]
[/TR]
[/TABLE]
[TABLE="width: 0"]
[TR]
[TD="class: xl74, colspan: 2"]Focal Length[/TD]
[TD="class: xl65, colspan: 3"]3.6mm[/TD]
[/TR]
[TR]
[TD="class: xl74, colspan: 2"]Max Aperture[/TD]
[TD="class: xl65, width: 505, colspan: 3"]F1.6[/TD]
[/TR]
[TR]
[TD="class: xl74, colspan: 2"]Angle of View[/TD]
[TD="class: xl65, width: 505, colspan: 3"]75.7°[/TD]
[/TR]
[TR]
[TD="class: xl74, colspan: 2"]Mount Type[/TD]
[TD="class: xl87, width: 505, colspan: 3"]MTV mount (Interchangeable Lens)[/TD]
[/TR]
[/TABLE]

I am looking to replace this with a 2.6mm or 2.8mm lens. Can anyone advice where to buy the correct one please.