Removing the Falcon outer tie rod end, and threading the donor car's tie rod end in. This is necessary because the Granada spindles have larger holes for the outer tie rod ends, so the stock Falcon's outer tie rod ends will not tighten up to the new spindles. This is necessary so undue stress isn't put on the soft hose when you turn the wheels. Others who have done this swap have warned that when the Granada outer tie rod ends are used to replace the stock units, they can't be threaded into the steering linkage enough to attain the correct front end alignment. From my experience, it can be done, but you also need to adjust the inner tie rod end as well.
Bad alignment can cause excessive wear and dangerous driving conditions.
If you are using Granada parts, always look for a 1976-1979 V8 car. You want to stay within the confines of these years. By 1981 Granadas were built on the Fairmont platform, and they had a strut suspension, along with four lug wheels. Inline 6 powered cars have different, weaker parts in their suspension and steering. You will find that you can fit the new spindles, but the new tie rod ends won't thread into the inline 6 steering linkage.