Replacing Rod Tips

The eyelet on one of rod tips came off earlier this week. I replaced it with a Fuji rod tip I had in my fishing tackle Armoir. The inside diameter of the spare rod tip was a little large but I made it work with some extra glue. What do you guys do to buy the right size replacement rod tip? Do you just keep a variety of spare tips on hand and see what fits?

Barlows tackle shop in Richardson has tips. If you need them often buy an assortment off of amazon and an alcohol lamp and the hot glue stick (hot glue for archery inserts is good)