Originally Posted By UCUDANT
Finding the grommet is fun smile The PCV is 3/4 where it enters the valve cover. I ordered (am awaiting) a grommet online that is 3/4" ID, and 1" OD. Since I have aluminum valve covers Iliked this one as it appears deeper and I will trim the lower neck if I need to.

http://www.ebay.com/itm/Ford-Mustang-PCV...2-/111669199849



This grommet is 1.22 OD flame