What is the part number for the plastic scale lamp diffuser on a 1780R or 1781R?

What is the part number for the plastic scale lamp diffuser on a 1780R or 1781R?

The replacement part number for the clear acrylic lamp diffuser is 378-0338-00 and for the smoke-colored acrylic plate is 378-0332-00. These numbers can also be found on page 10-4 of the 1780R service manual. Both of these parts can be ordered directly from Tektronix by calling 1-800-833-9200 and selecting option 1 at the prompt.