Sorry, Jerry and Dan. I failed to explain that I'd be looking for a spigot mount that matches my current flange mount. I'd really like to maintain the current orientation with a flat slide like Jerry's. I'd also really like to find an angled spigot mount that has a nipple for a vacuum hose; a vacuum gauge might be really useful for tuning.
Jerry, it's a Lifan GY5 from the mid-2000's; it was one of the more prominent bikes on the forum back in the day. You can read about it here:
http://www.chinariders.net/showthread.php?t=12512 It's fun for me to re-live the thread from five years ago.
Jerry, where did you end up putting the pilot mixture screw with the 38?