A cooler with NPT threads then, and then just AN to NPT fittings and screw on your hose fittings..

Are you going to join up to the old hard lines, or go right to the trans with the hose? You can go hard line to AN too, or just get fittings to go directly into the trans too I suppose (not sure the size off hand)

I like using as much hard line as I can mostly, since it is less likely to have an issue then hose.. (especially on a street car)