I am looking to upgrade my radiator to a two core. The radiators I found on ebay are listed as single core and two core. The single is listed as ALUM (23 x 16-3/4 x 1-1/4) - 1 Rows. and the two core is listed as ALUM (23 x 16-3/4 x 1-1/4) - 2 Rows. They are the same thickness. How can you get an extra row and still be the same thickness? Or are they full of it. The stock radiator is also 1 1/4'' thick. Whats up with this. Anyone buy one of thies or have any insite into this?