It may be a while till Musikding carries the Tube Screaming Preamp as a kit because it is new and i have to ship him the boards from the USA.
As for connectors to poteniometer pads with the smaller pad we refer to those as Pin Headers.
I do not really care for them myself but I have seen others use them.
You must have a 2.54mm or 0.1″ spacing for them to fit either the potentiometer pads or the T&S Pads on the Input and Output. Here is a LINK for an example.
They make them in two wire, 3 wire (seen above) and other forms. The 2.54mm or 0.1″ size is important.