http://www.mightymite.com/necks/index.html It say p-bass, but it might be just what you need.
or try warmoth.com.
You should measure your neck heel and compare it to the neck you want to purchase. Pbass and Jazz bass neck heels are the same in 4 stringers, but there is no standard for 5 stringers. Even if the neck heel width is the same, you may have to file the neck slot or the neck heel a bit to make them fit perfectly.
If it's a 21 frett, with a hangover at the end of the board, that should not affect the scale, the only real concern is the width of the neck heel.
