i have used a couple. i had a hole for the pcv valve but no baffle, so this coused me some headaches. i had to make a baffle since my intake was getting some oil in it. i don't think the large hose from side of valve cover to bottom of filter is that important. it can prob be omitted if you go to a breather without the hole in the bottom. i doubt you will be abe to find one of those. both mine were used alum valve covers and had the hole for pcv valve. i'm sure you could drill a hole and mill off the fins if need be. good luck to you.