Heat Sink Calculation Help

NM High Desert

Active Member
I have pulled the heat sinks and drivers from a MarsII 900 to use in my next DIY project but I am struggling with the math.

My plan is to cut the sinks into pieces that will support 1 CXB3590 per piece to achieve my desired spread.
I will be active cooling.
If my measurements are correct the heat sink profile is 45.06 in sq.
Using the driver pictured, with 2 cobs per driver, can someone help me figure out the length per piece.
Thanks in advance.
 

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