The 556 number is probably the table style number as most 20th century furniture has !! The information on the glass is pretty self explanatory,, #18133 is most likely the replacement number should any of the glass get broken !! 1/4 in. Golden Topaz color, size 17X15/16 with a 1 In. bevel and a carton of 2 !! does that match the table ?? You could possibly look the table up by the brand and the style number 556 !!