Here is a nicely detailed 9" Ford OEM-style rear.
This version is the stock width (2-1/4") and there is a narrowed width Ford 9" found here.
This rear is also available with an included brake set and in either in black or white.
The width can be shortened to fit your needs by cutting the axle tubes.
Assembly required.
Resin parts, by Futurattraction, 1/25 scale.