What are these parts described by the service manual?
Center one is the element. You can tell because it has a metal outer tube, white ceramic filler and a center nichrome wire which is the heating element. It is a loop and each end of the loop is the spade terminals attached to the center nichrome wire. This is a typical build for an immersion heating element.



On the other two, it's a moot point which is which as they're both showing continuity at two tenths of an ohm and should be ok.

The thermal fuse would be showing infinity if it failed and is probably the one on the left. It will be long, rectangular and the body projects into the hot water stream so it will fail if it gets overheated.

The right side item looks big enough (round center section with two wings that have the spade terminals) to have one of those snap action thermal discs and is probably the thermostat.