This seems to be a a default paper size options issue on the Ship your order Print EBAY Shipping Label printer driver options.

Dymo LabelWriter 400 Turbo 2 5/16" x 4" label options not included in the printer paper size options | Ask a Mentor

Dymo LabelWriter 400 Turbo 2 5/16" x 4" label options not included in the printer paper size options | Ask a Mentor | eBay Community