Rear shock bolt sizes?

JE8154

New member
Can anyone help me out with what sizes and grades the rear shock bolts need to be. I stripped out the nuts while changing my shocks last weekend. I found some 12mm class 8.8 bolts. I think the originals are 13mm but I'm not certain. If anyone knows what standard size I can replace them with (9/16th?) I would appreciate it.
 
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