You are welcome, btw. in my setup I got some M16 DIN125 metal washers (o-ring) which fits perfect using Alphacool HF QDCs (it's not the "Eiszapfen" version). Check first the mesurements of your QDCs and keep in mind the maxium external diameter should not over ~ 3.2 cm per metal washers (o-ring), because both need to be placed in short distance to each other, this took me a while to find a correct one.