Can I replace this bearing? (MTB head tube) As you can tell from the pictures below, it's about time I did. I'm clueless as to where I'd get new a one. From this answer I think I can conclude it's an integrated one as opposed to a press-fit one, or am I wrong?(EDIT: I was actually wrong, they are press-fit ones) I figure the bottom one will also need replacing, I hope/figure they sell these in pairs?

Possibly relevant info:


Bike: Giant Boulder, no idea what year. (Can someone tell me this?)
Front shock: Rockshox Tora 318, 1.1/8 inch tube (measured at the top)




Any help would be much appreciated!

EDIT

After much more research and measuring all sorts of things (head tube inner diameter top and bottom, steerer tube diameter top and bottom), I found that these bearings are EC34/28.6 EC34/30 (SHIS), the first part being the top part and the second being the bottom.

For anyone else looking to identify their bearings, take a look at this helpful web app that helps you get there step by step:
Canecreek Headset Finder: canecreek.com/headset-fit-finder

This answer can also be helpful.
It's the most common kind of threadless headset. External cups, caged bearings. It uses a 5/32x20 retainer (bearing size x count), which again is the most common type and available online and at most shops for cheap. If you want you can also use loose 5/32" balls, which is more of a hassle but slightly better for headset longevity because you get more contact area and loose balls migrate around more freely and reduce pitting.