A previous thread on here had recommendations for either
http://www.fossewayperformance.co.uk/wire-wheel-balancing-kit/
or
http://www.smoothridecones.co.uk/

both of whom do mail-order... if you can't sort out the dimensions to machine a set locally.

No direct experience of either - my car doesn't have wires.

Doug
1985 4/4 4str, Jubilee Blue