Bicycle Brake Light Saddle Mount

I bought this motorcycle led strip light that has both turn signal and brake lights on it: http://s.click.aliexpress.com/e/mA2b6E6

I wanted to install it on my bike and the only suitable place that I can find was underneath the saddle.

The saddle has two 7mm diameter cylindrical rods spaced 37mm apart.

I had to make it curved because of my limited build volume on my Wanhao Di3.

It needs one M4 screw to fix to the saddle, it might be tricky to tighten the bolt (I use long spanner).