What bore size?
ZeuS sells a single radius tuning slide for the Guarnerius (a Mt. Vernon Bach Strad replica).
Single-Radius Tuning Slides *****
round bend, single radius crook .470" bore
raw brass, raw brushed brass - $110
lacquer and brushed lacquer - $125
silver - $135
See:
http://www.zacharymusic.com/Zachary_Music/NewZTR900.htm
A couple left in .464 bore.
Might be worth looking into if the bore size matches.