The Polo WRC has small plates (they were baptized by VW as “rosette”) at the rear screw connection to the longitudinal member underlaid to increase the friction and against cracking noises.
Photos of rosette in genuine Polo R WRC Street:
source: ibiza-forum.de
WHT005350 – rosette
2 * WHT005350
– rosette (friction enhancing plate from Polo R WRC)
WHT 005 350
Fitting position
Installation position of intermediate plate (R WRC only)
Long side of intermediate plate -1- must be inserted perpendicular to direction of travel. Lugs -arrows- must engage in assembly carrier -2-.