autozone has harmonic balancers with two grooves (so they say) Auto krafters also sells harmonic balancers with the requisite three bolt holes to attach a second crank pulley.
I found one in one of the Mustang Catalog companies, the dampdoctor wanted me to send in my old one and pay something $150.00 for the two grove. Check around I paid about $100.00 for a new rebuilt one!
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