Canadian RS Spoiler Help

[skeck]

I recently purchased the used spoiler pictured from ebay from Canada for a Yaris hatchback. It was $150 and already painted and cleared as an exact match for my car (as it came off of a Blazing Blue Yaris Hatch.) Supposedly it is an OEM spoiler that was only available on Canadian Yaris models as an option. I am hoping someone here has some guidance on how to install this bad boy. When I look under the backside of the hatch door I see about four locations where it appears the factory had left markers for possible holes to be drilled to attach spoilers. The tricky part of this spolier install is that it requires you to attach and drill in from the hatch to the underside of the spoiler and hit exact locations on the spoiler, hence my hesitation to move forward without some guidance from someone who may have the same spoiler installed. My only other option I can think of is taking it to a Toyota dealer to see if they can install for me, thinking that they may have the knowledge to do so or the ability to get this info from Canadian counterparts. If anyone has any advice or instructions for how to install, it would be greatly appreciated.