I have a ss red R4P just into port, so in a month or so, I'll pick it up. I too plan to exchange the low roof rails for Adventure rails, to use with my versatile 58" old square style Thule racks that the foot base wraps around the roof rails. I have three bike rails, mast holders, ratchet straps, etc to fit this style Thule racks. I've had them since my 2003 WRX wagon was new, and use them on my current Forester. I easily remove them when not in use, which cuts wind noise and fuel use. I know I would not be satisfied with the reduced functionality of what is available with the stock R4P.
The Toyota Adventure roof rail part number shown above is
changed on the BAM website, it's the same for both gas RAV and R4P vehicles when you search for PT278-42190-RH (or LH) :
"RAV4 Rfrck Side Rail
Part Number: PT278-42195-RH
Replaces: PT278-42190-RH"
There is no picture to confirm that the replacement part numbers are for the Adventure roof rails, not the low rails. The left side listing has the same change. I'd hate to buy and pay shipping on the wrong ones. I wonder if a Toyota parts department person would have access to a picture to go with the part number to confirm the roof rail type.
OR....If anyone with a current model Adventure or TRD wants to swap roof rails over the winter, I'm coastal DE and Lancaster, PA, with two car wide garages.