I just ran a VIN of a similar 4 door bronco and it came back with the MB3Z-18125-K. So it looks as if the information in that post you’re talking about is either incorrect or outdated. The 2 door and 4 door rear shock is not the same.Also, I find it concerning that there is now a second High Ride rear shock choice. Per "The Definitive Guide to 2021+ Bronco Ride & Lift Heights with Wheel & Tire Sizes"
there is only one choice (MB3Z-18125-K).
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