just built up a free ranger, headset is an intergrated one is42 28.6 top section, some how i managed to loose the top crown race bit from it, anyone know where i can get hold of one without having to buy a whole new headset.

Superstar Components will sell you just the top cup parts. So too will Hope and I think Cane Creek will too. CRC might sell separate top parts but you will have the check there as I haven’t looked at headsets for a while.