If you can't find an OEM upgrade, I highly recommend buying an aftermarket TPMS on Amazon for $50-$70. Super easy to install, the sensors simply replace the dust covers on the valve stem, and the receiver is the size of a deck of cards, wireless and can be put anywhere in the cab. You can literally install a complete kit in less than a minute.
These systems are also very accurate, often have extra features like tire air temp and different alarms for pressure and temp. They also update faster than the OEM units. I've used these for years on my older cars, absolutely love them.
Negatives? The cell batteries on the sensors usually only last a year or two, but cheap and easy to replace.
Here is a good example:
Amazon.com