Here are the promised links to the other parts I ordered from China:
Links to the cigarette lighter male and female connectors:
https://www.ebay.com/itm/Car-Cigaret...e/222881194912
https://www.ebay.com/itm/DIY-BEST-12...D/332465563236
Some handy solderless 12v 5x2.1mm connectors (not used for this project, but for use when using the remaining "bundles" as under-cabinet lights....
https://www.ebay.com/itm/10X-Male-Fe...w/322245627163
There's some interesting stuff to find from these Chinese sellers on Ebay....