Carbon fork swap, Civante - Wabash - Urban Rush

I've ridden my Civante on gravel with a carbon fork (and WTB knobbies) for over one year now. My fork has a carbon steerer so I dropped an aluminum insert into the steerer for extra insurance. Below is great link for how to do install the insert by Leonard Zinn (Zinn Cycles).
What aluminum insert did you use
 
Insert sold by Corner Cycle in Falmouth, MA

 
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