Radiator for a 400/440 in a 73 Charger

[nge]

Needed some help/advice.
I need to replace the radiator in my 73 charger with A/C. A/T and a 440 installed by a previous owner.
I have the parts book, but all the radiators I findfor the 400/440 have an intlet hose on the drivers side.  My 440 has both the inlet and outlet on the pass side. 
Does any one know the P/N for this?
Also, the parts book talks about at 'top tank switch opening" after 3-15-73. does anyone know what this is?  It doesnt appear that the ater market makes any mention of this difference.
thanks!
Vic 

[Nacho-RT74]

before 73 radiators outlets are top on passenger and lower on driver side.

since 73, both changed to passenger side... this changes allong with water pump outlet side from driver to passenger, AND steering pump location, being lower on laters and with a bolt provision for steering pump support on block casting.

MOSTLY of parts available are for earliers.

If you can't find the right FULL radiator setup for 73 and lates, you can take it to a shop and use your existing lower tank to fit it to the new radiator.

I think you can get JUST the radiator section, without tanks and brackets and attach to, your tanks and brackets setup... thats what we use to do locally down here in Venezuela

the "switch" provision is for emission controls, an oxigen sensor bolted to upper tank and connected to a vacuum lines harness