Coilover sleeves??

[sprocket]

Hi, where's the best place to obtain steel coilover sleeves approx 42mm id to manufacture my own rear coilovers for a 93 Polo coupe??
Any help greatly appreciated
Sprocket

[ktfright]

I honestly wouldn't know bro. Maybe try a VW Polo specific forum for a better answer as for what kind of sleeves you need.