Here is a thread on the round door latch:EFM Round door latch
Mine was broken and I made one out of a piece of sheet stock, didn't take long and wont snap like the cast original. On the other hand, many people have a broken latch and don't worry, as the weight of the door against the gasket will seal.
For the broken studs on my restoration, I took a bolt, cut the head off, then welded the cut off end in the hole on the base. I took a grinder to any excess and was back in business. Take everyone's word on here and put some anti-seize on ALL threads on these boilers. You will thank yourself later if you ever have to take something apart.