You can buy the o2 spacer on ebay and see if that works , if you do plan to sell the dc manifold id be happy to take it of you as im looking for a aftermarket manifold .
You can get that tint dotted film that can be put on headlights i forgot the actual name for it , otherwise just get light tint film and if you dont like the outcome or road visibility gets poor atleast you can just peel it off.