The W210 dash is called one of the least durable parts of the car and cracks almost universally with age, typically around the airbag and the defroster vents. Replacements are described as scarce and expensive; some owners hope for a modern-material reproduction run and note MB once replaced them under warranty when the cars were new.
Dashboard cracking, nearly impossible to replace
Mercedes-Benz E55 AMG (W210) · cosmetic