DiMarzio DP 705 D X2N 7 BK

I got a cheap Chinese 7 string for my son. it plays great but sounds meh.
I've used dimarzio pickups before always loved them
this has a great sound and has 4 wires which would allow for coil tap, series or parallel wiring
the only criticism is that the fixing holes are not tapped. I think this is so you can use the existing screws and drill and tap the holes yourself. they supply springs for mounting and so could provide the screws to match the tapped holes. I suppose they don't know if you want black or chrome fastenings but the cost of supplying 4 mounting screws (2 of black, 2 chrome) can't be that muck
other than this minor gripe, the pickup sounds great and the cheap Chinese guitar is now very playable