I get cables from them, too. They carry just about any type of modular cable you can imagine - flat or round, coiled or straight, and usually some choice of color. They ship fast, and their prices are very reasonable.
However... note the "Style" column (rightmost column) in that listing!
"Normal" "Standard" style is wired 1 <==> 6, 2 <==> 5, 3 <==> 4, 4 <==> 3, 5 <==> 2, and 1 <==>6. This is what I think is called a "straight" cable elsewhere (but see below).
"Reverse" style is wired 1 <==> 1, 2 <==> 2, ..., 6 <==> 6, and is (again, I think) called a "crossover" cable.
In my opinion this nomenclature is backwards, but telephone cabling (and voltage - but that's another story) "standards" and some of its nomenclature has always been somewhat haphazard.
normal standard/reverse descriptions above are based on datasheets and samples of both styles I've received from Digi-Key, but note that my straight/crossover designations above are the opposite of what's shown in the image that Rac19 posted; I've seen illustrations (and descriptions) showing the way I describe as well as the opposite (but fewer of those, I think). Ugh!
Whatever you get, make sure it's the correct wiring before attempting to use it! If you have the original cable, or one you know works, compare the color sequence of the two ends side-by-side and be sure the replacement has the same arrangement. Get it wrong and something is likely to release the magic smoke that makes it work, and, once it's out, it's impossible to put the smoke back in and it don't work no mo'.
[Edit] Correct error in nomenclature. Apologies.
Edited by SkipW, 14 October 2019 - 10:52 PM.