70-72 vs 73 cooler lines

I would buy the 67-72 lines. If you look at the pics the differences seem to be at the K frame area.
1967-1972 Dodge/Plymouth MoPar A Body V8 727 904 Transmission Cooling Lines | eBay

1973-76 MOPAR A BODY V8 AUTOMATIC TRANSMISSION COOLING LINES 2PC SET OEM | eBay