This is part of the BONZI' Throttle Cable Assembly that is a machined aluminum piece which attaches to the butterfly arm on the carburetor with an arm that hooks up to your throttle cable.
For Walbro WT-257, WT-488 and new WT-813A
How do I tell if I have a WT-813 or a WT-813A carb?
If you purchased a Walbro WT-813 carb from BONZI' on June 16, 2008 or after, it is the new WT-813A. If you purchased it before then from us, it is a WT-813, which requires the smaller bore size throttle arm standoff. You can also check on the carb itself where the number is stamped accordingly.
Available in seven anodized colors.
When receiving 813As the stand off tab will need to be removed as it is not compatible with our hardware.