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Posting this as a PSA as this information was really difficult to come by.
My battery started going, so I opted to get the Optima Battery as it was the only AGM variant in my area. For whatever reason, Bosch discontinued their supply near me.
After I put it in, I noticed it looked terrible due to the smaller Optima footprint, and the bracket isn't really securing the battery.
Several other people have similar issues, noted here:
However, they are backordered for a month. Notice they mention the OEM bolt in both the thread and site, but with little specifics as to what that part is.
So I took a leap of (educated guess) faith and it works. The replacement bolt is from an ES, with the only difference having a threaded end instead of a hook.
Be sure to look at this thread for doing this replacement without entirely disassembling that area for understanding the mechanism:
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.
PSA: Upgrading Battery Tiedown
