Sorry I didn't get what you were saying.

All WRXs have always had the BOV flange made into the intercooler meaning you cannot get it seperate.

Now most WRX aftermarket front mount intercoolers have a triangular flange fitting so you can use the stock BOV. However from the companies we deal with we cannot get them seperate.

Your best bet would be to find someone who has done such an upgrade and did not need the flange.