This listing is for a single gearbox top cover assembly. These are the later style for the three rail four synchro Triumph gearbox as fitted to the Spitfire MkIV, Vitesse 2L, Dolly 1850, 1500 RWD, GT6 and others, with integrated reverse light switch. I have several, this listing is for one. They’re all in as ‘barn found’ condition. Mucky, but nothing obviously wrong. I would recommend stripping and cleaning them thoroughly before use.