Well, some deep digging on the interwebz reveal that they are indeed discreet items.
From the few places you can find oddball OEM items like this it appears that they are sold as 1-gang, 2-gang....6-gang units with specified switch combinations for each part number.
What that means is that if you have heated seats but not the parking sensor, you'll need a completely different switch gang (not just the switch button/pads) to add the parking sensor and have it be/appear OEM. At least from a PnP standpoint.
Originally Posted by SvenskaJeepGuy
There is a mopar kit to add heated seats. Otherwise it would need to be activated at a dealership
Thanks for the advice! I actually have the Mopar kit installed and as you are no doubt aware the switches are just small round DPST that you try to locate in an inconspicuous place. Hardly what I would call a seamless integration. Hence my interest in finding out just how difficult it would be to bring it up to OEM specs.