I have a Telegizmo 365 for a mount I have on my deck. I bought one to suit a 4-5" refractor on a GEM but have had a 8" newt and a 8" SCT under it. At the moment it is just covering the mount. The only problem with a large cover is that you will probably need an extra strap like a bungee to pull in the excess at the bottom, otherwise a good wind gust may lift it off. Mine is over three years old with no sign of wear.
Greg
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