So mine fell out (the bolt...not the insert...yet...) from my front right shock...gotta lock that insert back down because its popping up when I hit humps...noise and probably very bad for it!

Anyone know what size it is?

 

OK I thinkbi figured it out its m12 x 1.5mm. Oreilly auto had them but not as high tensile strength as is wise (highest) so I got one and will order the right strength online.