All the suppliers sell the fittings for ramrods, and short starters. You need to fit the ferrule to your rod, and then drill a cross-hole, and pin and epoxy the ferrule to the rod. I prefer having a ferrule that will allow the use of a Delrin( synthetic) muzzle protector on the rod, so I can protect the muzzle during that all important first step of seating the PRB.
If you go to Membership Services, on the index page to this forum, and look for " links", click on it, and you will get to a list of suppliers. Most have on-line catalogues. Track has good pictures of its products, so can learn what you are buying, or looking for.
I won a T/C Short starter, with the Wood Ball handle, stainless steel rod, brass, tip, and delrin muzzle protector in a shoot more than 25 years ago, and am still using it. I have a short starter I made, and was just given another one made entirely of Delrin. I don't know if I will get around to using the new one, unless I dedicate it to One gun, and put it permanently in that gun's shooting bag.