Those tiny bolts are easy to break—here’s how to remove.
remove the pipe and take to a machinist.
You have to drill it out and tap the threads. You ever use tap and die? It’s simple work if you’ve done it before but problem is those are short pieces welded to the pipe
Drill with cobalt bits—start really small. Smaller than a pencil lead. Start dead in the middle of the bolt. Stake with a center punch if you can. Your can try to use an easy out but I wouldn’t try it—break the easy out and you’ll def need a machinist.
Use the right tap i just did mine i can remember what size