I got a giant integrated tapered 1 1 8 1 1 2 headset from the lbs which also had the straight steerer crown race adaptor in it.
Tapered fork to non tapered frame adapter.
If your mountain bike came with a straight steerer tube you can use this bearing adapter to put in a tapered steering tube and run a different fork.
This will work with any bike with a pressed bottom cup that is 1 1 8 although i believe this no longer allows for frame warranty check with bike manufactur.
Fitted the headset and the adaptor crown race to the fork and works perfect.
How to install a tapered fork into a no tapered head tube using hope pick n mix head set cups music by.