It’s just a band of aluminium that’s the same width as one of the prongs of a go pro mount. Put a quarter turn twist in the middle and drill both ends, voila!
Yep, drilled the guards and mounted another Go Pro mount in to the front of the guards. I was worried that it would vibrate too much but it’s absolutely fine, even with a big Strada on it. Stick some plastic spacers between the prongs to make sure the fit is super tight.