When I built my GPS connectors last year I cut up a MC-30 remote control (it has all 10 wires in it). To use the MC-30 I used a 2.5mm stereo plug and socket to piggy back it via the GPS unit, the MC-30 only needs 3 wires. Don't buy the cheap Adidt (?) remote controls off eBay since they are just push in (not screw down) and don't have all the required wires in them.
Nova-photo-and-electronics on EBAY has aftermarket Nikon 10 pin cables with locking collars. They're available in various lengths already set up for use with custom GPS or remote release purposes. Prices are cheaper than buying Nikon releases and gutting them, quality is very good.
Which cable are specifically referring to? I only see male 10p plugs with various connections on the other side. What I need is a 10p female plug, where these cables will fit into, with on the other side loose wires or so.
My apologies, all of the custom GPS hook-ups I've seen have needed the 10 pin plug to plug into the camera, I misunderstood what you were looking for.
For the recepticle end (jack) to plug into, the Nikon MC-21 extension cable has what you may be looking for but it's $$$ just to cut it up. Check with your Nikon repair facility to see if they have a replacement jack for the MC-21 cable and if they'll sell it to you. The MC-26 adapter has a 10 pin jack but I don't know how it's wired since it's used to convert to a two pin connection.
I haven't seen any aftermarket Nikon 10 pin jacks anywhere.
The MC-26 has a small PCB that pins-out all 10 pins. It has another small PCB with 2 SMT parts (diodes?) to convert it to the 2 pin connector. Unfortunately, the connector, the housing, and a mounting boss make it inconvenient (at best) to work with outside its case. Using the case and replacing the cable (and the second PCB) with the 3.5mm cord/plug would probably work well.
They are no longer available from Nikon. (eBay, $40. A crime, admittedly, but cheaper than a MC-21)
"In theory, there is very little difference between theory and practice. In practice, there is a great deal of difference." --Yogi Berra
"In theory, there is very little difference between theory and practice. In practice, there is." --Yogi Berra