If the steel lines are rotted out or the rubber is cracked or torn, you may want to see what the dealer price for replacements are before cobbling together something that is not reliable and will trash that expensive transmission.
Regular fuel or emissions hosing WILL NOT WORK!!!! Fluid pressure and heat in the transmission lines are high, and regular fuel line is not rated for such high pressure and heat. Emissions line is rated even worse. I would even avoid fuel injection hoses because they are not designed for the heat.
That's why the engineers use steel lines. Where they have to flex, they use a special rubber line that is rated for the pressure and heat. There is rubber hose available by asking for hose used with transmission cooler installations. These rubber hoses are rated for the high pressure and heat that the transmission fluid will subject it to. If factory replacements are not available, some steel brake line and this special trans cooler rubber line can be used to fabricate a sensible replacement.