If the fork is 1", and so is the stem, then it's 1" spacers. If you're using a 1-1/8" stem with a shim underneath, then it gets trickier, and depends on whether the shim is longer or shorter than the stem.
You need a continuous stack from top cap to compression ring, so the top cap can press on a spacer, then that spacer can either press on the shim (1" spacer) which in turn presses on more 1" spacers below, then the ring. But is the shim is shorter than the stem it can't touch both above and below, so there's an interruption. Ideally you'd add another spacer, but with an ID small enough to slip into the stem.
Otherwise you want spacers with a 1" ID but an OD big enough to press on the stem, so the line is cap/spacer/stem/spacer/conical ring.
As long as you keep the idea of an uninterrupted chain of force, you'll come up with the right answer.
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