Avery.com offers Custom Blank Labels you can create on our site avery.com/templates. To create a Custom Size Blank Label Template in Word follow these steps here
If you receive the message The margins, label size, and number across or down values produce a page that is larger than the label page size this may be an error with the Tall label dimensions. Try flipping the label height and label width in label options and keep the margins and pitch the same.