Thanks for the side pic. Now I get why 20630 might not work on the TNT. Magnums seem to have a little more room. The TNT's engine compartment seem to be more compact. Does your Magnum have a 26 inch radiator? I'm not sure why Chrysler didn't make everything the same with such large cars.
The problem I was having with my heater hoses was that they were melting too close to the exhaust manifold, being crushed by the A/C hose, kinking due to having to turn 90 degrees. So after playing with lengths, the longer hoses seems to work best for me. Plus it never made sense to me why Chrysler made the A/C hose so close to the heater hoses.