Thanks 70Chall440 - It has been a learning experience for me.
The following is to help the next persons who do a similar build. I had a very hard time finding credible information on the internet related to radiators, hoses and what worked. With that in mind, maybe this will help the next person. Again, my build is with a Gen 3 LX motor (2012 Challenger), manual (Non-vvt), and I had a 26" brass factory big block radiator originally with a passenger side 1.5 upper and a driver side 1.75 inlet lower.
To start changing things, I purchased installed a Champion CC375B radiator. This appears to be the same size and dimensions as my 26" brass factory radiator, so my justification for doing it is - its lighter, modern and easily adapts dual fans. When I purchased this, I talked with LedFoot racing asking for a "swap radiator," the CC375B is what they recommended. With that said, I asked what hoses they used - response was - I don't know, go to a parts store, measure and check. I called Champion, same general response. I them called Bouchillon - well that response is a whole other story, and not pleasant nor helpful.
So after going to a parts story many times, here is my solution: The upper radiator hose I used was a Gate 22900 - I trimmed it about 6 inches and perfect fit. Lower hose I used a combination of the old BB upper hose, old factory 5.7 hose attached to the motor, a 1.5 to 1.75 adapter\reducer, a piece of 1.5 aluminum radiator tubing. I spliced them together using the 90 degree 1.75 portion of the upper hose from radiator to bend, then trimmed 5.7 hose back, spliced with pieces of aluminum and 1.5 adapter\reducer. I get it this is a little "June Bugging," but it worked for me, only costing me the price of aluminum hose and adapter ($5, and $8 respectively).
As a side note, I understand an SRT lower hose may work. I went to dealer, but one was not available. Down the road I may order and attempt to verify this to correct my "June Bug" approach.
I do hope this helps someone else down the road.