Edited post for clarity, accuracy and uploaded images.
The cone was actually 15mm. I discovered cones on the back are common 15mm, and front 13mm. The replacement axle I ordered is probably for the back, so I'll search for a front axle.
I found a reference for wheel to fork nuts: fasteners. Sorry about the inner/outer labels. Guess it is fasteners, lock nuts and cones. I'm learning...
Originally Posted by
operator
None of the information you provided makes any sense.
16mm is uncommon for front wheel cones.
No such thing as inner and outer locknnuts. You just have locknuts. They usually take a 17mm.
Post a photo bro.