http://www.dansdata.com/images/coolercomp/holes500.gif
according to dan you're very slightly out rotor 
i'd go for 2" wide as well, and make the block as long as you can before it interferes with capacitors, make the base 3/8" - 1/4" thick, 1/4" if it's a big block, 3/8" if it is around 2.5" x 2" in size
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