Apparently, I ordered the wrong candles (for wifee), so I needed to return (3"x6") and get the correct (4"x6") size.  The original, incorrect, order was easily returned to Wayfair with their emailed instructions.  My wife has just opened the 2nd order and advise me the replacement candles were "perfect"...Merry Christmas to me and hope these candles will last ten years, as did the first ones she is replacing.