Here's a great alternative to mounting a USB port if you already have a RAM mount on your Spyder (or any motorcycle).  

No need for any other mount or device, simply loosen and unbolt the knob, slide 1 of the 2 options for the USB mount on the bolt and screw the knob back on.  

Simple 1 minute mount.  Route the included braided loom wire to an accessory wire for F3 series or an OEM 2 pin harness for the RT.  

It doesn't get any better than this to mount a USB port. Fast dual 2.1amp charger ensures fast charging for all your electronics while riding.