Where to find Simulation models of Electrical Components?
All simulators allow the installation of 3rd party simulation models.

Look first at the manufacturers' websites for popular and newer components, under tabs like technical, support, models, design files, simulation or the like.

Unfortunately, the availability of spice models can be a bit patchy. Older and less well used devices can be hard to find. A general web search can sometimes throw up models from other places.

You might, as Peter Smith says below, have to roll your own.