* Will they physically bolt on? No. A Jeep Wrangler X (assuming you mean a JK or JL generation) comes standard with 5-lug wheels. Rubicon 16s are typically 6-lug. You'll need to change the wheel hubs to make them fit. This is a significant modification.
* Will they fit with modifications? Yes, but it would require significant modifications including changing the wheel hubs (as mentioned above), potentially needing new brake calipers depending on the Rubicon axle setup and potentially additional suspension and body work to clear the tires (depending on the tire size you're using with those wheels).
In short, while you might be able to *make* Rubicon 16-inch wheels fit a Wrangler X, it's not a simple bolt-on swap. It's a major project involving significant mechanical work and likely exceeding the cost of just buying wheels that fit. You'd be far better off buying wheels designed for a 5-lug Jeep Wrangler X.
