I am about to travel the well worn path of KW V1 coilovers for my Polo GTI.
Having read previous threads I am about to order the following parts:

strut spreader tool:
VW/Audi Front Shock Absorber Tube Strut Suspension Spreader Socket Tool | eBay

Strut top mounts HD & Sports Susp (Part No: 22930) :
VW Polo 2005-2009 (9N3) Front Suspension

Do I need to order the bearings listed on the same page, Part No: 3176401 or are they
included as part of the "Strut top mounts" ?

Does anyone change the rear shock mounts?

I installed THS Seat sport intercooler yesterday. Will post some pics soon.
Cheers.