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Measure the diameter of your dew shield and then ask the dealer if they could measure the minimum and maximum diameter for the two filters you are interested in. Note there are three nylon screws that can be adjusted to fit onto tubes smaller than the maximum stated. Note the 180mm filter would likely have adjustment down to 160mm.
My #07745 filter has 10mm adjustment (in radius) for each nylon screw and I would think each Orion filter would have the same. I assume you are looking at the #07737 & #07723 filters.
The other thing you could ask your dealer is to measure the diameter of the glass filter section to avoid it hitting the edge of the dew shield if it is too big before you set the screws. You want the aluminium cell to touch the edge of the dew shield although you can have the filter a few mm in front of the edge of the dew shield.
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