i disagree. you need to replace either the garter spring - by getting one off a new or used wiper - or replace the entire thing. the springs are formed into a loop by "threading" the ends together. it requires careful fingers to put one back together with the wiper in place, but it can be done. in fact, when i rebuild forks, i tighten the springs in both the wiper and the seals. it makes leaky kayabas practically trouble-free.
Could you buy one at a hardware store or anywhere besides a Honda dealership? The place I bought my bike from is near my house near Penn State, so it's 3 hours away from my regular house. And Service Honda has a $7 shipping fee, so I'm outa luck.:(
Perhaps you can salvage the one you have if all that is wrong is that it is stretched. As Will previously mentioned, there is a 'male' end of the spring that essentially screws into the 'female' end. Find the connection, unscrew the male end from the female, and cut a section off the female side, shortening the spring. Then reattach the male end.