When I made my short runner I just had a local machine shop turn me out one from a TB gasket. It was about a half inch thick and tapped for bolts. I wound up running studs in mine and using nuts to secure the throttle body. I had to have it made like this because I also couldn't find a producer of these. I even contacted USRT about them selling me a spacer plate without the holes drilled. They declined. Hope this helps.