Crash box C1 and Level 2 Hgv.https://www.bbc.co.uk/iplayer/episode/m001b0qc/inside-the-factory-series-7-buses#xtor=CS8-1000-%5BPromo_Box%5D-%5BNews_Promo%5D-%5BNews_Promo%5D-%5BPS_IPLAYER~N~m001b0qc~P_InsideTheFactoryBuses_SEG_PNC%5D