This part can now be purchased using Tesla's online parts catalog, EPC for $140 and shipped to your location. It's under 44 High Voltage System, 4401 charge system inlet. Click on the image. Look for 153764-00-B and add to cart. It might automatically substitute with a direct substitute 1537264-01-B that should still work.
1537264-00-B Gen4 charge port ECU - No Stock
SKU: 1537264-00-B
$159.00Price
Out of Stock
Reviews
This item once installed with a new software update from Tesla allows me to use CCS chargers on my 2018 Model 3.
Very good and fast service