The PIAA 910's can be installed several different ways.
The PIAA 910's come complete with wiring harness, Relay, Waterproof switch and full instructions.
Shown with brackets that are not included
This is the 910's using a BLM mount.
No cutting of the plastic is needed.
The bracket uses the vent above the mirror.
This install uses the ST1300 Dick Seng mounts.
This will require a small amount of cutting the plastic mirror covers,
The full instructions are available at http://koczarski.com/Motorcycles/ST1300/PIAAs/PIAAs.htm
