Back up light switch

Thanks for the help!  RockAuto still has the T5 reverse switches (mounts on the drivers side trans case) for $16-18.  Look under the electrical switch/relay category for an 84 mustang.  it's a 'back-up lamp switch'.  Do NOT get the LS221 called out for the 82-83 Nissan 280zx turbo- won't fit