Why is this so expensive? It’s a genuine Toyota OEM part. Make sure you order an OEM part to avoid slop in the steering. We’ve seen customers with aftermarket manual joint/yokes that are not the best quality and degrade steering feel.
Use this u-joint/yoke with a manual rack (along with a longer intermediate shaft) as the power steering u-joint/yoke is not compatible.
One of the first modifications that is recommended for AE86’s intended for spirited, track, or drift use is changing the power steering rack for a manual steering rack. Especially for drifting, you get more steering angle when combined with power steering knuckles. The power steering knuckles are a little bit shorter than the manual knuckles, which gives you a faster steering ratio and allows the same amount of steering rack travel move the steering knuckles further for more steering angle.