Fender uses the Shaller strap lock buttons on their guitars, you should be able to find a set at a guitar shop rather easily. Two of the four I visit have them in stock all the time. They're a bit of a pain to mount to your strap, but after you get them on good and tight they save you a whole lot of pain, suffering, and agony as your beloved axe drops to the floor. On the other hand, they make squeaking noises and confuse people who don't use them.