Mine looks exactly the same, but I got it off ebay (new) 6 or 7 years ago for about $180 if I remember right... Only problem with these (or probably just the knockoff ones) is the aluminum tends to strip out over time if you are not careful torquing them down and they don't hold tightly. I drilled mine out and added stainless steel heli-coils to all the threaded parts. Great strut bars!
Do you have any paperwork (receipt?) showing it is genuine ACS? That would help any doubters...
Nice looking Engine!