It depends on what type of flange/bov you have/need. Do you have a bov with a normal lgt style flange, a wrx style flange, or need an hks style flange? Weld on flanges can be found easily just by a simple google search.
you just have to have a shop cut and weld the flange on and your good to go.
and btw the LGT style flange is a greddy flange type
^shawn06specb: x02 is a manufacturer that makes intercooler kits as well as other parts