970 crankshaft bolts..

Hi...well it appears IV lost 3 bolts from the crankshaft mains. Two 5 inch and one 7 inch... probably some where in the fantastic floor I have in my open air shop...lol. Good lighting but doesn't keep out the weather to well.
Anyway are these bolts grade 5 or grade 8. It appears that in probably going to have to replace them so was wondering if anyone knew what grade they are.
Man I'm sick of this weather...still 2 feet of snow in the fields.
 

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