17" gti 180 wheels

[thebluepearl]

Hi all I have a set of gti 180 wheels looking at hubcentric spacers with tapered bolts, I know I need 10mm front 15mm rear but not sure on bolts do I require tapered or flat seat bolts and also do I need a specific size head on bolt as the holes in wheels look pretty small in diameter cheers for any advise

[Jimbo]

Flat seated bolts, 17mm and 19mn heads both fit fine