Shimano Telora rod tips
I decided to go with Torpedo swivel tips on my 8' Talora roller guide rods. It was a little challenge getting the old tips off and lost a little length, <1". I like the Torpedo tips so far. See this thread for some more discussion.
Likely you will have to get your Torpedo tips over the internet. I think Marine General and Lake MI Angler have them in stock. I think I also saw them on EBay when I was looking.