Brass gas inlet fitting is HD part # 27371-76.
Here's the procedure I use although there is always more than one way to get things done.
3. Note the position of the elbow and mark it on the carburetor body. This will allow proper positioning of the new elbow.
4. Break off the plastic portion of the original fuel inlet elbow. This will leave the brass portion projecting from the side of the carburetor. (obviously this has already been accomplished in your case)
5. Using a ¼-20 or ¼-28 tap, tap the remaining brass piece approximately ½” deep.
6. Remove the tap and insert a ¼" x 3-4" long piece of all-thread into the now threaded hole. Do not go so deep as to damage the carburetor body.
7. Use a piece of tubing that is large enough to go around the outside of the opening to act as a spacer. Place a washer on top of the spacer and over the bolt. Thread a nut down onto the washer and gently tighten, pulling the brass piece out.
IMPORTANT! DO NOT SKIP THE NEXT STEP!
8. After removing the brass piece, wash the carburetor body with hot soapy water. Remove any debris or chips.
9. Mount the body in a vice with the inlet hole facing up.
10. Heat the carburetor inlet area. This will ease installation of the new elbow.
11. Position the elbow lining the elbow portion up with the mark you made previously.
12. Quickly insert the elbow into the carburetor body. You may need to gently tap it in to seat it. Do not distort the body!
13. After positioning and installing the new elbow, thoroughly clean the carburetor body.
14. Reassemble the carburetor following your service manual. Install new seals and gaskets as necessary. Check for proper float height.
15. Reinstall the carburetor and check for leaks before doing a test ride.