SR Suntour XCM v3 forks Headset
There are a few factors to choosing a headset, primarily frame related:


Does the frame require a threaded (1") or threadless head set?
What is the headtube/ steerer type (1.5 straight, tapered, 1 1/8 straight)
Is the headset integrated (cups sit within the frame)?


Deciding if a fork will fit is a bit easier, is the steerer the correct length (it can be longer, you can use spacers above or below the stem for fit) and is it compatible? You can get headsets that interface some head tubes to steerer they are tapered steerer in 1.5 head tube or 1 1/8 steerer in tapered head tube.

Firstly identify what headset you need first and work from there. Cane Creeks headset finder is a good start.