The RSM isnt sumpless ... just has a sump in the back and not like the traditional sump under the tank setup....
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The 70mm cylinder (2.76 inches) should fit the back but if you go look at the images, I think the additional space needed by their mounting bracket would make it a no-go in the back of a 130 or 130D. Looks like it would sit up pretty high also - no closed hood or at least no skimmer flap.
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Hope that helps ..
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