Help required for microbore rad system

Hi

Anyone andise where I can get a replacement rad - the system here uses the one piece flow and return valves that require inserting a 10mm copper pipe inside the bottom of the rad to take the flow to the far end of the rad rather than straight out of the return side of the valve,  Most of the rads on here have offset valve threads which would prevent inserting the copper pipe. I realize that only  a single rad will incorporate this feature.