Sixth-generation 3 Series, 2012 to 2019. The F30 was the first 3 Series on the platform BMW went on to reuse for the 4 Series and the X3, and its wheelbase grew markedly — almost all of that gain went into rear legroom. This is the generation in which the turbo four became normal and the straight-six became the exception.
Pre- and post-facelift is the line everything turns on. The LCI arrived in 2015 and changed headlights, rear lights and the front bumper trims. Those parts are not interchangeable, even where the mounting points look like they should be. Door cards are our commonest F30 part, with mats and interior oddments after them.
Everything else stayed remarkably stable: doors, wings, bonnet and most of the interior ran unchanged for seven years. For used body panels that makes the F30 one of the most straightforward 3 Series there is.
On the relatives: the F31 Touring is identical at the front — bonnet, front wings, front doors and the whole nose are the same parts, and the bodies diverge from the B-pillar back. The F34 Gran Turismo is its own car despite the name and shares little sheet metal. And the F80 M3 has its own wings, bumpers, bonnet and mirrors: as a panel donor for an F30 it is of very little use.
