Flex Plate Bolts...

So my new converter has bigger bolt holes than my stock converter 7/16 vs 5/16 on the stock. My stock flrx plate is also 5/16 holes. Should I just drill the stock flex plate and buy some grade 8 7/16 bolts to run. Or I found this flex plate, B&M 10235 on marketplace for 80 bucks. Is this 7/16 bolt holes. If so should I run that with the grade 8 bolts I will buy at the store?

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