Older MIM Dlx had the 4+1. newer ones are 5 on 1 side. The newer ones have noiseless single coil pickups, too.
The newer Am Dlx have 4+1, but have block inlays, bound fretboards, N3 pickups and an active/passive switch with passive tone control.
SPECTOR® Club #369 | Fender Owner's Club #13