Well, unless you're swapping your front axle too, you're not gonna find a 9" short enough to match your stock front. Most common 9"s are probably gonna be in the ballpark of 63-65" wide.
Also, the 9" uses a 5 on 5.5 bolt pattern, so that isn't gonna match your stock front.
Other than that, you'll have your basic stuff like moving perches/shock mounts, driveline angle will depend on the rest of your setup, brake plumbing, and so on.
1995.5 Isuzu Rodeo - SAS'd and SOA'd, sitting on 36x12.50 TSLs, D44 front, 14bff rear, locked by OX and Detriot, suspensions by Jeep and Chevy, high steer conversion, 5.13 gearing and Teralow in the case.