I bought some on eBay, and by the time I designed my wiring, I found I didn't need them because I am running two separate 240 circuits into the control box. Each one comes in and is connecting to its own 2 pole on-off switch, and from there through the DDR to the heater element, one for HLT, one for BK.
I will run a 120 line off one pole of one of the switches to feed my 120 V items. This will be distributed with contact strips since they are all low amp devices.
You are welcome to the distribution blocks I have, I paid about $25 USD for them with shipping. I'll sell them for $25 plus shipping from MN to AB.
PM me if interested and I will send a better discription and maybe photos if I can figure out how...