I don't think anything did. I am going a different direction for paddle shifters.
Snoopy Panda has discovered a few things about the AT operation in the Sedan and the Coupe, one of them being the manual shift mode is all electronic. Nothing physical happens when you move it from D to M, in fact, it is possible (through programming) to eliminate the physical aspect of moving the shifter into M for manual gear selection.
Take a look at the Coupe and Sedan clock springs, which is sandwiched between the steering
wheel and air bag module and serves to connect everything electronic in the steering
wheel. Tracking Hyundai's part numbers is almost useless as they will sometimes change part numbers with no revisions (Example being the BH sway bar end links, for 2012-2014 they changed the part number, but changed nothing physically, same links from 2009-2014). Let's look at Hyundai's diagram first:
Left is the Coupe and while it has one clock spring style saying "ESC", all Coupes had Electronic Stability Control. It really should say AT (Automatic Transmission) instead of ESC as only the automatics came with the paddle shifters, this being the only variance between the Coupe steering wheels other than with/without audio controls (To which it still uses the same clock spring). On the right is the Sedan and 93480A is listed as Rain Sensor, which it's not obviously the sensor itself, but rather just if it is equipped with auto-sensing wipers.
Now here is what the
aftermarket shows, these are supposed to be for a BK1 Coupe with paddle shifters and BH 4.6 with rain-sensing wipers:
Top is Coupe and bottom is the Sedan. Same pin-out and connector on this side, both air bag leads are identical, despite wire colors being a little different. Now the other side:
Left is the Coupe and right is the Sedan. Again, same pin-out and connectors on this side except for the white one (Which Hyundai labeled as "ESC"). The Sedan one did not come with the "rain sensor", I guess BWD expects you to transfer over the old one. If you look closely at both clock springs you see where the "ESC" and "Rain Sensor" clip into the same spots.
So.. theory being the Coupe steering
wheel should transfer over, air bag, clock spring and all. For Technology package Sedans the Sedan clock spring may have to be re-used. So not only can you, possibly, get a factory steering
wheel with paddle shifter integration, you also have one that is better designed for performance driving and you have companies like Down South Kustoms offering perforated leather/Nappa leather/Alcantara wrap services:
The other unknown factor is how radar cruise control would function without a distance button.