Finally found the original trackball for Compaq Contura laptops! I actually got two of them (for $10!). They are Logitech TrackMan Portables styled to match the Contura.

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The Conturas are some of my most favorite early 90s laptops. I really like them. I definitely like them just as much (if not more) than the LTEs of the time. I have 4 of them (a 3/25, 4/25, 4/25c, and a 4/25cx). The 4/25cx actually has a built-in trackball. It was the only one of the first-gen Conturas to have one.