Confusing title I know, but I need to know if all valve keepers are the same. I was instaling the freshly cleaned valves from my cousins crf250x, and on the very last one (of course) the tool slipped, the spring recoiled, and the valve keepers dissapeared. So now I need to buy new ones. So do I have to be machine specific or can I just buy a few and get this thing back together? Thanks..