I'd also be making it as easy on myself as possible and picking up a Harness for an EF. It'll make fitting your aftermarket unit a snap and give you the option to reinstall the factory unit. Plug-in and Plug-out!
Made by Aerpro and available at most auto/audio type stores for $20~$30.
Shown below is an ISO Connector for Ford Falcon EF-EL 1995 on;
Cheers and best of luck.
PS> Interesting USERID you have