This kit from Energy Suspension is a problem solver at a great price. The factory steering rack bushings aren't available separately from Toyota- you must buy the entire steering rack. The factory steering rack bushings do wear out and get loose over time- especially when using larger tires and/or running off road frequently. This causes a wandering feeling and sluggish response in the steering.
This polyurethane bushing kit will replace your factory steering rack bushings and stabilize the steering rack much better than stock bushings. Comes with instructions.