Honda changed the design of the boot area of the Mk3 during the production run: early cars have room for a full size spare, later ones don’t. Search the forum for posts about this. That said, if you only have room for a space-saver, then that’s your only option unless you want to carry a full-size wheel in the luggage space. Space-savers are quite limited in usage, eg should only be used at low speed (<50 mph) and for a short distance, so really only suitable to get you to a tyre centre. And you have to ask yourself if you’re really comfortable changing a wheel at the roadside which can be a bit of a hairy place. If you want one then I’m sure a Honda dealer will sell you one, or there are lots of 3rd party sellers online.
