Another tip that may help is that I found quite important to fit the new cooler lines to the filter housing - doing up the nuts hand tight - so you can still rotate the cooler lines into the correct position for the mounting brackets.

Doing it this way round (rather than attaching the mounts first) means that you will probably get a really good seal at the joints and you won't have to force the cooler lines into position. The previous owner / mechanic who had fitted the previous lines on my car had tightened the top line so hard that it was twisted... this must have restricted the flow of oil to the cooler.