Hey Wrinx, not sure if it's relevant for car engines, copper piping is an absolute no-no anywhere near synthetic oil on jet engines! I seem to remember a reaction between additives and copper causing fouling and additive depletion
Try going down to a Hydraulic supplier`s they may be able to make some pipe`s up for you the same as the one`s on the car for a lot less money
Are you sure it`s the pipe`s that are leaking or is it the cooler..............If it`s the pipes then be very careful when undoing the ends as they might fracture the cooler before they undo
Or is there a local motorsport shop they might have some various pipes in the one down the road from me had some when we fitted the cooler to the SUD .................but they probably want top money for them
Be very careful when you try to replace the pipes, from memory, they appear to be treadlocked as well, so you may well find that trying to undo the pipe from the oil cooler wrecks the oil cooler as well. Just to cheer you up.