My understanding is that it isn't just the controls that are missing, the adjustable lumbar support is missing as well. That part number is:
MS3XY 1R POWER LUMBAR SB ASSEMBLY | 1118494-00-G |
(Which of course will require additional screws/bolts and isolators.)
There are lots of options for the switch assembly with, and without, lumbar controls... So you would have to figure out the correct one.
epc.tesla.com