Stronger replacement rear springs

[Russie]

Good day al polo heads
My polo 9N 2005 1.4 has a LPG system fitted making it tail heavy and lower at the rear. I'd like to fit a set of rear springs which are thicker. That would then counteract the additional tail weight and make the rear sit higher. Does anyone know which model of car uses springs which have stronger/thicker coils while maintaining the same dimensions. The idea is the get those at the local wreckers and swop the originals out. I need about 3 to 4cm lift to get the car back to its original stance. Any advice greatly appreciated ladies and gents

[iichel]

probably a cross polo 9n3/6r/6r

[Russie]

Thanks ill check it out buddy