Polybush manufactured the uprated polyurethane strut top mounts merging the existing MK4 Strunt Top Mount with the shorter Polo MK3 Strut Top mount thus gaining the 10mm additional suspension drop. This means that when fitting the Polybush Strut Top Mounts that Polo MK3 Top Cap (OEM Number 6N0 412 319) has to be used to ensure correct location and fitment, thus preventing the knocking that few people have reported when using existing deep dish top cap
I have fitted a number of the Polybush mounts myself with Polo Top Caps and have no issues with fitment or Knocking.
