With todays setups almost all Wissota Street Stocks suffer from occasional (or consistent) bottoming on both front shocks.   The result of LF bottoming is generally free entry while RF bottoming can lead to the RF washing up the track on later entry. 
 
The F43 Street Stock Front Bumpstop uses the maxiumum Wissota allowed thickness [per Street Stock Rule 4.B] and has a special design that allows a gradual force ramp up to cushion harsh bottoming.   Developed and manufactured in-house
 
In order to meet WISSOTA rules of 0.50" of travel limiting material the travel indicator o-ring must be removed.  Intended for use with shocks with 1/2" shaft diameters or smaller.