all it is is just a brace to stop flexing. if you were a real handyman you could probably just make one up..lol that said in comparing the two they look pretty much the same mechanically.
get the cheaper one if you want to try it out on the track, its a no namer so you wouldn't think twice about painting it black to match your car. your the one with the good lookin black 34 with black 34gtr rims?
I got a cusco one for my 33 from nengun and it doesnt look the same as the pic with all those holes...looks more like the ebay one as being a solid mount that you bolt on.
they are a good mod, braking is alot firmer.