The 2298721-2: This is the shell that holds the female SMB Fakra contacts — you bring your own crimp contacts and the mating plug. It's the piece a harness builder or field tech reaches for when they need to terminate a coaxial antenna line into a standardized automotive connector interface, and the white colour tells you at a glance it's Code B, so no guessing which plug it accepts.
Four positions arranged for the SMB Fakra contact pattern, with Code B mechanical keying that prevents cross-mating with other Fakra codes. The housing is moulded from polyamide (nylon) with glass fill — tough enough for the under-hood temperature swings and vibration an automotive RF line sees. It accepts TE SMB Fakra female contacts (sourced separately), so you're not locked into a pre-crimped lead; you can build the harness length you need on site with a standard crimp tool.