Funnily enough celestron have it on their website and then talk about looking up the edge HD FAQs for their unique values, but they're actually nowhere on their site (you probably found them in a separate blog like I did). Here is the reference for the regular OTAs:
https://www.celestron.com/blogs/know...celestron-scts
In inches it's as follows:
C11 5.475 in from 3 in-2 in Reducer Plate
5.975 in from 3 in Primary Mirror Baffle Tube Lock Ring