Rear light for Aero post

I've googled and checked the forums and not found any recent posts (last year or so)
After finding out that my old mtb lights are not going to fit my Giant TCR I was wondering if anyone could suggest a good rear light which fits an aero seat post (think I am right, it is non circular) or an adapter that will work. Guys in my LBS don't think the catseye brackets will do the job so I am reluctant to buy one to find they are right.
Thanks in advance
After finding out that my old mtb lights are not going to fit my Giant TCR I was wondering if anyone could suggest a good rear light which fits an aero seat post (think I am right, it is non circular) or an adapter that will work. Guys in my LBS don't think the catseye brackets will do the job so I am reluctant to buy one to find they are right.
Thanks in advance
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Posts
http://www.bikeradar.com/forums/viewtopic.php?f=40042&t=12796196
I have one mounted on my TT bike.
http://owningalegend.wordpress.com/2014 ... ced-price/