My L3 build has a 98mm motor mount but I am using a 75mm motor for certification (M1500G). I'm using the AeroPack 98mm engine retainer and the 75mm-98mm adapter kit. When I went to install the centering ring part of the adapter it wouldn't snug up against the 75mm Aerotech casing no matter how much I tightened it....to the point that I snapped off the head of the bolt . So I drew up a replacement in Fusion 360 and printed it in PETG on my Ender 5-S1. Fit is perfect. Tightens up nicely around the motor casing and slides into the motor mount tube with no play.
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