[Engineer]

I have not seen the part either but here is a "handyman/shadetree/garage mechanic" fix for broken studs like this. Use a long nut to hold both pieces together. Drill down the center with an #30 or #29 drill in a drill press. It is important to go straight down. Drill through both pieces. You can remove the nut after you've drilled the hole. Now get a 1/8" brass rod and cut it the length of both pieces. File a flat on one side of the brass rod the entire length. File or cut a slot at one end about .030" wide and .0625" deep. Use a good flux and cover the surface of the brass rod and the hole you just drilled in both pieces. A Q-tip works well for getting the flux in the hole. Now you are going to solder the brass rod in the hole to join both pieces. The flat you filed in the rod will give the solder a path to flow down and the slot will allow you to use a small screwdriver to turn the brass rod to help all surfaces get covered with solder for good joint while it's hot and the solder is molten. Use a high wattage solder iron/gun or a torch works well also to produce enough heat over the large area.

Watch the heat carefully so you don't melt something you down want to melt.

Be very careful tightening the nut as it will only handle less than half the torque it did before you broke it. Good luck.