Hi, I'm looking for a 17 tooth front sprocket for my K157FMI engine (not to be confused with the 157FMI); I've been searching ebay for the last 2 hours with no luck. The sprocket I'm looking for needs to have and inner diamater of 20mm with 18 inner teeth, it needs to be the same as this one here but with 17 outer teeth instead of 16. If anyone can tell me where to find one that would be great.