That grommet for the walbro carb is part number 1123 123 7500 according to DIY spare parts. Should look something like this. I just replaced a wt-215 on an 025 with one from farmertec, working ok so far. I did have to turn down the diameter of the idle screw head, it was too fat to fit in the grommet. About 1-1/4 turns out for both h/l. Came with over 2 out of the box, crazy rich.