Engine bolts broke

Zachat03

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So my 78 xs400 has a seized engine so I went to pull off the cylinder head to manually rotate the pistons but before I could get the engine apart almost all my bolts broke in half or completely stripped. The worst part is I have no idea where to get replacements. Anyone have suggestions?
 
Basically all the bolts on top of the cylinder head I’m not exactly sure of the sizes but the bike was sitting for 20 years so they all need replacements
 
I know I have them all but if you could take a pic of them with a ruler next to them I can gather them up. There should be 16 bolts.
 
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These are the only ones I could find that hadn’t snapped off
 

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Here is what I have. It should be all the case and head bolts other than the studs. But I have them all. Let me know what ones you need. 38 Total.
DSC03850.JPG
 
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Thank you but that’s my main issue the bolts were all jumbled in a ziplock bag so I have no idea where any of them go thank you for the offer though
 
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