BOV are flange mounts. You would have to have a section of aluminum pipe with a flange on it. Unless your turbo'd, stick with a BPV.
I would suggest this part if your going with the BOV and/or w/ BPV adpt. I purchased one and it is of decent quality.
eBay Motors: BOV Blow Off Valve Adapter Flange Turbo FitsGreddy 2.5 (item 170120217595 end time Jun-15-07 04:27:02 PDT)