My ā17 has the recessed Allen screws. Maybe late in the model year there was a change? Iām sure no one changed them out unless there was crash damage needing replacement of the entire valve/system. It not easy!
I do know this truck was sold late in 2017, so it's possible it was a late build 2017. And just to make sure I'm not taking crazy pills I checked the VIN and it's 100% 2017. Carfax has no crash reports (bought 6 months ago with 39k miles on it - 3rd owner) - and other things confirm it's not 2018 such as manual hatch, resistive screen, and VIN reading 2017.It's a whole lot of work, as Sandroad said. Most likely just came from the smaller of the two factories or while they were phasing in the change.
Thanks for info, I know a lot about 4Runners but still learning about Land Cruisers. You guys are a wealth of knowledge!