FYI on Mopar valve cover breathers

I was looking for a pair of twist in valve cover breathers for my Wiand aluminum valve covers.
I ordered a pair of Mopar P4529880 breathers. when they got here I tried them on but they were to sloppy in the holes. They wouldn't tighten up when twisted in due to the space. Well if you ever order these,I thought I would relay the fix I came up with. I use a thick 3/16" rubber O-ring with a one inch hole behind the heavy metal washer and Bamm they twist in nice and tight!