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Hi Shawn,
Looking at your photo, you can replace the 16.5mm spacer with a ZWO filter drawer and still keep focus fine. (Or any other filter drawer that's 16.5mm thick / deep / long.)
The only problem is the thread size - I can't tell if they are M42 or M48 extensions tubes in there.
To that end, the ZWO filter drawer is M48, but mine came with an M42-M48 adapter ring so it will fit both size tubes.
I do strongly recommend that you do not buy anything right now. Get your information and measurements first.
Cheers,
V.
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