Yes sir, I've tried JEG's and even called them. I've done a Yahoo search and had considered a radiator cap bolt on "bung" to cut the top neck off my little tank and bolt one of them on, but the tank I got is only 3" across the top and I think they are too big to bolt on, it did not give the width of them on JEG's. I even call a friend at the local Chrysler dealership to make sure that the cap's on the reservior let air out and back into the top of the reservior. Since I'm adding fans and a gauge to my heat exchanger it may not help out that much more to seperate the systems, but I still would like to while I've got the car all tore down. Thanks for tring to help me out.