Currently building a new mountain bike and for the time being I'm using the old forks until I buy some new ones.
My question is how do I find out what type of headset I need? Because from my understanding there are quite a few different types.
Update: I have uploaded a couple of images. It looks to be integrated, as there are bearings/cups already in the frame and threadless. The steerer/stem width is 1 1/8th.
I think that solves my question.