Just installed my Sexy Breather Bolts...

...from Bench Mark. Big props for a cool idea. Yeah, they might weep a little when the small filters get saturated. No biggie, they're held in place with a c-ring for easy removal and cleaning. In my opinion it's worth the extra maintenance to have the cleaner look. Here's the link:
http://benchmark.bigcartel.com/product/evo-breathers