MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I made these for my Tronxy E800, which is basically the Anet A8 by any other name. As others have remarked, the Acrylic is 7.15mm thick, and these brackets appear to have been designed for an interference fit with 8mm acrylic. Not a problem since I'm printing with enough slop (ironically due to the lack of rigidity in the frame) that the inner dimension still comes decently close. So I used a two-part epoxy (2-Ton Flowmix), schmoo'd it in there, used painters tape to hold it in place and bobs your aunty. it made a noticeable improvement in consistency of the X axis printing, though not the accuracy. However, that will be fixed by upgrading to fiberglass belts and the improved tensioner design, which is printing now.
Just a side note - clipping these on may provide some mechanical support, but regardless of fit, your maximum effectiveness will come from apply epoxy on the inside portions of these claps either way.