While you have it all apart, why not replace the O/F housing-to-block gasket? Now is the time to do it. And while you have the O/F housing off, replace the seals at the cooler hose connections on the housing. Those fittings are 24mm. Also get a new gasket for the back cover plate on the housing. The part numbers are as follows:

616-184-07-80 (housing-to-block gasket)
617-184-01-80 (rear cover plate gasket)

Also, it sounds to me like you removed the entire engine mount arm, rather than just the mount. The lines can be removed by just removing the engine mount rather than the whole assembly.

One last thing; Be careful when you retighten the cooler lines back on the cooler itself. Those threads are aluminum and strip easily!

If you decide to go with factory cooler lines, here are the part numbers:

617-180-05-82
617-180-01-82

__________________
Regards,
Aaron