You would buy two passenger side proximity handles. You can’t use a driver side proximity handle on the rear because it has a key hole in it. Since you’ll be mounting a passenger side handle on the driver side rear door, the release flap will be upside down. So, you would remove the flap from your current driver side rear handle, and install it in the correct spot on the new passenger proximity handle.
View attachment 42683
View attachment 42684
Then, you would run this custom wiring kit to connect the rear door handles to the front door handle wires located under the driver and passenger side front door sills.
View attachment 42685