Where to buy components (in US) to build SPI cable for Up Squared?

I'm interested in flashing a new BIOS to the Up Squared directly, using the CN22 header.
I know there's https://wiki.up-community.org/BIOS_chip_flashing_on_UP_Squared which explains what cable is needed, but I'm having trouble finding components to create it.
I've looked on mouser, digikey etc., but can't find a 12-pin 0.635mm (0.025") socket, or jumper wire with 0.635mm pitch. I was wondering if anyone could help?
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From Mouser.com:
I also needed a ADP-SF600-TO-SF100xCB adapter for my flash programmer.
One will probably also need some jewler's glasses and some needle-nose pliers.
It took me about three hours to make the cable, having never done it before.