GETTING MY C5 ESTATE ALLOY WHEELS BALANCED PROVED A PROBLEM AS THEY HAVE SOLID HUD (ie NO HOLE IN MIDDLE ) AFTER CONTACTING COUNTLESS TYRE FITTERS, ASKED A MAIN DEALER NEAR BASILDON ESSEX AND WAS QUOTED £17.50 PER WHEEL, (MY LOCAL CHARGES £6 FOR STANDARD WHEELS ) THEN FOUND .........NATIONAL TYRES BRAINTREE OPP LIDL SUPERMARKET HAD A 20 WANDER AROUND THAT AND ALL DONE £7. 50 PER WHEEL HOPE THIS HELPS SOMEONE ELSE. PS NOT ALL NATIONAL TYRES HAVE THE ADAPTER