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That sounds pretty hefty. You might need to get busy with a file.
The MKS ones come in a couple diffferent versions for different thicknesses I think.
There are designs where the thickness won't matter, like a Surly Tuggnut, it just pushes against the back of the dropout instead of slotting over
Looks like these GT ones work similarly, https://www.skatepro.uk/381-48673.htm?stockcode=45221050122&gclid=Cj0KCQiAvqGcBhCJARIsAFQ5ke4fpQE0VqIAYXsAJ5gr9TrDuIJVipHECqfMJHWQSAEIEuIC08NM-g0aAtQhEALw_wcB
This is a where to find question, the dropouts on my fixed are 8.1mm thick, anyone know where I can obtain chain tugs that will slot over these?