You got a PM...but if I read your thread right, I just did the German Pete Block Off Plates (aka desmog mod) Napa Auto Parts is where I got the caps. I used a 5/8 universal rubber cap on the air box where the pair vavle hose connected, it's much more strudy than the 3/8 or 1/2 vacuum cap normally recommended. I measured the airbox and it's a hair over 5/8 so the cap is on nice and tight. If you are pulling the secondary air unit as per Bare's sight, you will need a 1/8 vacuum cap as well. As already stated here, ya can't seem to buy just that, I had to get a pack of various sizes, just make sure it contains 1/8. JB 8)