APC Back-UPS RS 800 USB Mod

I got hold of a used APC Back-UPS RS 800 but unfortunately did not get the data cable which gets supplied with the unit when purchased new so i decided to make my own. The problem with these units is that the data port at the back uses a RJ50 instead of a RJ45 connector and these cables are kinda hard to come by. The difference between the two is

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