It's a old tread, but maybe usefull for others users, buyed on 2014 a st185 Seibon hood on sale (450€) on Fensport:
Quality: 7/10, good carbon fiber, the design is slightly different from the original
Fitment: 7/10, came with pre-drilled hole for brackets and washers, but need some drilling to install the others mouldings and new cushion. Easy to paint with the right "paint adhesive"; the scoop's layout is slightly different, so need a bit of work for reach the maximum airfolow.
So, if you have a weight obsession (like me
-100 Kg on front), or a heavy damaged hood maybe worth the expense, otherwise keep the stock!!!