Miche hubs from that era were usually Campy clones, but I found them to be among the worst in quality of the many Campy copies: really soft alloy shells and poor tolerances of the steel parts. If you can find Wheels Mrg. cones that match the dimensions and threading (and measure with an acurate digital caliper plus a thread gauge for the axle threading to be sure) that's going to be much better quality that the original cones, probably better than they deserve (yes I am biased). You might just wants to replace the full axle "set" with new axle/spacers/cones/nuts. Miche components these days are MUCH better quality, at least the ones I've seen and used.