Ortho Base Set includes:

     42 - 1 space
     1 - 2 space (3 mounts)
     1 - 2 space (POS 2 mounts)

Ortho Modifier Set includes:

     20 - 1 space
     1 - 2 space (3 mounts)
     1 - 2 space (POS 2 mounts)