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If you have a ZR300 caseless module that you want to turn into a USB device, it would be feasible to turn it into a USB device, I believe, with the purchase of the connector parts and interposer component to join onto the main module board. Such conversions have been done with the ZR300's closely related predecessor the R200.
My favorite reference source for interposer and cable parts is Rutronik, who are an Intel Authorized Distributor. The old RealSense cameras tended to use the same parts between different models, so it is probable that the R200's parts would fit the ZR300 module board.
Interestingly for those considering doing a USB conversion for 400 Series caseless module board cameras, Rutronik apparently stock an interposer for the D400.
The connector parts for plugging in a USB cable into a caseless module board are sourced from a company called I-Pex.
I have never known the casings for RealSense cameras to be a separately purchasable item though, unfortunately.
I researched your question extensively. It confirmed that Rutronik is the best (perhaps only) source for purchasing the cables.
If you need a US supplier though, a company called Adventurer's Bag is selling the R200 USB adapter board through Walmart's website. Since the R200 and ZR300 models share some of the same components, I believe this would be the best option for giving a caseless ZR300 module USB connectivity.
You might also consider contacting the company that produced the original cables, Amphenol-GIS.