Wow, you've been really lucky with custom!
Well, let's start to answer...
Here you'll find a good picture about where to install chokes (from diyaudioprojects forum):
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fdiyaudioprojects.com%2FForum%2Fdownload%2Ffile.php%3Fid%3D1391%26amp%3Bsid%3Ddb0ea13ee3ab2f9ceda4edf1989bff95%26amp%3Bmode%3Dview&hash=4b63d459cf9f3bb9bee9d653242ae7b740471d08)
i don't know if PJCCS is easy to install, but to me it seems pretty easy, Erik surely can be more precise
The chokes you found are exactly to ones I bought, I'm waiting to try them..no time to solder for now
Ciao