I bought a carb insert for my 3000 and dont understand how to install it. It appears to be too big for the carb I have. It is not the same insert that is in my K series carburator. I have a 3250 and a 3000 and dont see how it would fit into either of those carbs. Any ideas??

*edit*
What I bought was the insert for the engine so the carb fits in to the motor. I need the insert that fits inside the carb. Is this still sold?

Thanks