i'm looking for an m6 bolt but with a 13mm head. all i can find (and all i have to hand) have the usual 10mm head so the "face" of the bolt needs to be fatter to hold the sensor, and washers seem like a bit of a kludge.

the other thing is trying to replicate the double sidedness of the bolt (thread on each end) as i could resecure the heatshield properly then.