Direct Connection RB connecting rods

From the -75 Direct Connection catalog:
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The DC engine manual states that the Heni Forging P2531589 machined for the RB only is 6,760" long instead of the stock RB that is 6,768". (Some other sources claim that the Hemi Forgig RB rework has the stock RB 6,768" lenght.)
The stock street hemi rod lenght is 6,860".
I was just wondering why these have the 5/8" bolts and not the 7/16". Makes no sense if they are really the strongest Hemi Forgings.