Need help finding bolts for main bearing support plate

My son spun a bearing in his 03 p5. Got everything apart and back together, except one of the bolts for the main bearing support plate sheered. There is no way it should have broke at 20 foot pounds, so I’m now looking for a new set of the 8 bolts that support the main bearings on the plate (not the 12pt bearings holding the bearing cap).

I'm having no luck finding these online. Any help would be greatly appreciated.
 
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