The M22529 MilSpec series was expanded in 2023 with a third FAA/EASA Approved MilSpec grommet, M22529/3.  It provides multi-axis flexibility for edges on roll-formed and flanged penetrations which are common in many older -and frequently retrofitted- aircraft.  M22529/3 complements Spring-Fast® M22529/1 and M22529/2, which are for edges that need only 2-axis flexibility.

Go here for more info: Spring-Fast Mil Spec grommets