I haven't studied your carb, but I purchased a used Moki 6.5cc (.40 cu in) Marine engine which the needle was damaged. I was able to substitute an OPS needle assembly perfectly. It is actually a better quality assembly because of it, due to the OPS needle being an O-Ring sealed needle barrel. It is off of a .21 Rally Pro carb. I haven't any link to share that would be able to track one down from, but if you contact the nitro car guys you might be able to track one down. I heat painted my motor black, so it might look a little different at first, but the picutre will enlarge enough to see what style the carb is.