The Sidekick Sport is a redesign; different frame, suspension, & the 1.8l engine. As mentioned it had larger wheels etc & also had different body cladding. (1/2 way up the doors.)
There was also a Tracker Sport model... but... I believe it only got the cladding & trim changes, & has the 'standard' frame, engine, suspension etc. Since yours is a Geo Tracker, not a Suzuki Sidekick, it should have the same frame, suspension, etc that most 1st gen (non-sport) trackicks have... meaning aftermarket add-ons like Calmini lift should work with it.
A few pics would verify this, but the sure giveaway is the engine. If it's the 1.6l 16v, it has the more common frame.
Hth,
Fuzz