I'm sure they will be. If nothin else, maybe you could "doctor up" a stock filter tube to hold a MS filter. Just a thought. Also. Since we have seen the cap come off on a motor saver, and destroy an engine (sorry snakebite). A tip I found somewhere, is to take a small piece of womens nylons, and strech it over the filter, then zip tie it on. This keeps the cap in place, and will not let the filer fly off in the middle of a race. A little cheap insurance for the engine.