Grommet Selection For Miniature Rectangular TE Connectivity 1-640521-0
Associated Strain Reliefs 350522-1 and 1-350522-9
The difference between the strain reliefs can be found noted in the datasheet as their flammability ratings.
Datasheet Drawing
https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=350522&DocType=Customer+Drawing&DocLang=English
Associated Grommets 2-350379-1, 2-350380-1, 2-350378-1
Assembly Overview
Instruction Sheet Pg 4. Grommet Selection For Miniature Rectangular TE Connectivity 1-640521-0