You have a 1" steerer. You want the 22.2mm adapter (the inside diameter of a 1" threaded steerer). The adapters you linked adapt to a 1 1/8" (28.6mm) threadless stem. The adjustable stem you linked to is for 1 1/8" steerer, but comes with a shim for 1" steerer which you won't need. You must get the stem with a bar clamp diameter that matches your bars.