AM06WL-US provide exact same sizes as AM06WL.
It has the same nimble for identification on the lower leg than AM06WL, but no flex cut out.
Info: Parts with "US" designation are especially designed for the use at tracks with hard boards/barriers.
During the different design compared to the standard parts, the "US" parts are more reliable at impacts.
Basically this optional parts are a bit more heavy than standard parts.