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You won't be able to add this as a piece of custom gear. You will have to create this in the editor, under wondrous items create the robe, bootstrap Spell Resistance to it (xSplRs), then you will have to add 13 to its value. That's how I'd do it.
On the other hand, if it only give a flat resistance of 13, then you'll want to set the value to 13 instead of adding to it, using either its current spell resistance or 13, whichever is greater.
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