this is a tricky question from what i have found out i guess your not suppose to remove these . I even had a guy tell me that he went to kohler school and was told there to not remove them because one of the sets of holes were drilled while in the carb ??? i ended up buying a fuel inlet and new needle from brian millers site
http://************************.com/a1carb.htm At the time it was all i could find. I have built the carb but have not put it to use yet . The holes were not the same as the old inlet but he said with the new needle it was sure to work .
There may well be sponsors here or on another site that sell them also just at the time i was unaware of them .
hope this helps