NE part of SW Iowa
I'm going to guess, you will need a used Ag Leader Integra, AND its display cable (to get power into the that monitor) AND an Ag Leader cable to go out the back of tractor to mate up to the planter's cable; AND possible that you would need a cable to supply/steal your currently NMEA signal (GPS) and transfer it over to the Ag Leader monitor.
Might need another ram mount, too; for additional monitor inside cab.
I think you are going to need, more than one piece/component to complete your system.
"Line-Art drawing" of possible planter components:
(Ag Leader Line Art diagram for planters (full).jpg)
Ag Leader Line Art diagram for planters (full).jpg (57KB - 10 downloads)