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Actually you might have the 5/16" screws. The first listing I believe is 5/16" and the second is 7/16". So the flex plate with the round hole is 5/16", and that looks like what you have...
Technically they are screws not bolts, but that don't matter.
Lower performance cars got 5/16" the performance ones got 7/16". Both are listed in the service manual. The picture looks like 7/16" to me, but could be wrong.
I can one up that a little. Here’s a link to a you tube channel called Heart and Horsepower that I was lucky enough to be featured on a little while back.