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I take it you mean the cambelt idler bolts? I needed those too, and visited 4 different shops specializing in nuts and bolts and none of them had the correct bolts. If I remember correctly the thread is a bit finer than regular bolts (0.75/1mm rise?), and the shortest off-the-shelf bolts with the same thread were 20 cm long:rolleyes: and correct length ones had a prohibitingly long leadtime.

In the end I visited a local metal shop which made up 2 bolts with the correct threads from blanks. Took 10th minutes and was for free.

I hope you have better luck sourcing ones where you live.
 

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I just measured as i have the old drilled out bolts lying around in the garage (man, i really need to get rid of old unusable crap more often). They are m10 with 1.25 mm pitch, and regular m10 are with 1.5mm pitch. Not a proper funny thread size per se as that is standard fine thread m10, but apparently still not common enough.
 
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