I just recently modified mine. I used a normal valve cover breather. Found a fitting to insert in the end of the breather so I could attach it to my 3/4" hose that I am using. Mounted the filter in the rear of the pickup. Ran the hose back to the front and connected with the existing hose. I also stuffed the inside of the breather filter with scotch brite. My hopes is that it will just collect any oil that comes down the tube and I will just clean the filter setup each oil change. If this idea does not work I have found an internal transmission filter for a GM vehicle, its sealed except for a breather hole on one end and a nozzle on the other. The filter paper is VERY high micron so it should be able to collect any oil residue quite well. Yet again my plan is to just have to clean it every oil change. (I just bought the truck and I am starting to battle the leaks and I'll be DAMNED if Im gonna let a little oil bottle ruin my hard work)