Ditto on Texas T advise. Don't use rubber for transmission cooler lines... Trust me!
Here are a few links which will help you get the job done correctly.
Transmission+cooler+line+kits - JEGS High Performance
If you can't use steel or copper lines, go with these, Transmission Line Adapters, Aluminum, Black, Male -6 AN to 1/4 in.-18 NPSM and with these you can plumb braided stainless transmission cooler lines with ease.
Summit Racing® Transmission Line Adapter Fittings SUM-220027 - SummitRacing.com