Some cartridges have no manufacturer alive anymore, and styli are nowhere to be found. The Micro Acoustics 3002 that I have is just such a cartridge. Maintaining all original parts is not an option.
Mine has a snapped beryllium cantilever.
So it will go to a retipper. He can fuse on a boron rod to the beryllium rod stump, or an aluminum alloy, or sapphire, or zirconium, titanium, pretty much my choice, but not beryllium unless I have a donor cantilever. Tips? Pretty much the only limiting factor is price. Boron/MicroRidge would be the closest to original.
My choices are to wait forever for a stylus to come along, or have it repaired/retipped.
This stuff about only having the manufacturer do a repair is a bunch of bull hockey. Often, the reputable hand craftsmanship of a retipper can get tolerances better than the factories have the time for.