The Powerhouse Racing Solid Steering Rack Bushing Kit is a compound solution to the shortcomings of the factory power steering rack bushings:

The factory rubber bushings a prone to oil saturation, sponging and failure, resulting in poor steering response or an outright dangerous condition of total loss of vehicle control. This kit is permanent solution to these problems.

Furthermore, it is a great solution to sloppy steering on the Toyota Supra. The PHR Solid Steering Rack Bushing kit converts your rubber bushings solid billet aluminum for the most precise steering response possible. Road feedback is also improved. This kit excels on the track and gives you an edge of control that others will lack.

Precision CNC machined from billet 6061 Aluminum and featuring Class 12.9 Hardware, these are a quality product that you can be proud to have on your SC300 or SC400.

THIS BRACKET IS AVAILABLE IN BOTH 47mm and 50mm DIAMETERS.
The Supra and SC300 came interchaneably with either of these sizes.  The only way to know for sure if you need the 47mm or 50mm is to measure your rack.
Please see our link HERE on how/where to measure (take a look at the 2nd, 3rd, and 4th pics).