I have for sale Kenmore Elite Side by Side Refrigerator Glass Sliding Shelves.  They came from a Kenmore Elite Model # 79571033 . The refrigerator measured 33 " W  X 31 1/4 " Deep X 70" H .  Kenmore made 2 sizes of this model . Mine was the narrower of the 2 models.  Please look closely at the measurements of these shelves and compare the measurements to yours. On the brackets to the back of the shelf they measure exactly 14 1/8" from bracket to bracket . See attached pictures.  Make sure yours are the same width in order  to fit the grooves in the back of frig.  The shelves measure 19" long. .  See diagram E on the manual and attached page 24 . 
These shelves are used,  so they show some scuff marks on the glass from usage , but once inside the frig. they are not that noticeable. They are very sturdy shelves. I'm sure these will also fit other models besides this one,  but make sure you measure those brackets. My listing shows shipping cost for one glass shelf. If more than one shelf is purchased then buyer will be responsible for additional shipping costs.