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We have a 3120rl as well. Ours is a 21. I ordered a 39x90 and it works well. Had to order from 2 different merchants though. The first one came in damaged so I refused it. Packaging from factory is not well enough for the size and weight. Needed to put in risers so the slide would clear the doors. I just used 2x2 wood to elevate glide. Great upgrade for us
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