[Closed] Longer inner chainring bolts?

Had a bit of a comical mechanical at Penmachno, chain got caught between the middle and little rings and pulled 3 of the 4 chainring bolts out of the crank (XTR but with SLX little ring and spacers, looks like I was either using too much spacer or too short bolts). In any case, looking at it now I'd like a bit more thread in the crank than the bolts I have will allow, does anyone do a decent 12mm or at a pinch 10mm chainring bolt?

(the one bolt that held on was an XTR original I think, and by my ruler has 10mm of thread but I don't know if it's an inner or outer, inner I presume?)