Looks like some kid of bracket he found somewhere. You could just bend one up out of some stock or you could send him a PM and see if it is anything in particular. Most likely it wouldn't work with your cowl. If your cowl is stiff enough you can mount directly to it, otherwise bend up a bracket of some sort to hold it just below surface of the cowl. If a bracket, it will need good support so it doesn't give too much when you plug in and have it bend and eventually break.