PFF85-431W Front Strut Top Spacer (as normally supplied with PFF85-431 and now available separately) is a simple and cost-effective interim solution that fits and works with the OE Strut Top Cap to fill the gap and prevents binding up on the PU Spacer as the suspension turns. Fitting couldn t be easier either. Simply remove the existing Strut Top Cap from the car, separate the rubber ring from it, press the Cap into our Spacer and then refit it! NB; fitting this part is only recommended if the installed Top Mount is in good condition and there is a gap of at least 12mm between the top cap and body. If the OE mount has collapsed, you will need to replace the entire mount with PFF85-430 or PFF85-431.