[Mr70]

Jake
The Tag listed the tanks used to make that particular radiator..i.e. IA & XP tanks were used to make a BR radiator.
BR is also shown in box #45 of the bsheet.

Donnie
Yes,a 1969 BR used IA & XP tanks.It was the measurement of the various cores that were different amongst specific radiators.
BR used .16 Convolutions,meaning size of the cooling fins.
BJ used .18 Convolutions,meaning size of the cooling fins.

Below is the original off my '70 L-78,along with the original drain tube clip.
Notice the difference between this one & todays repops.
Also,among other noticeable differences,notice the repops do not have the 7 digit part # stamped into the bottom of them,like the originals,nor the last number indicating the month.