Williams disc forged calipers code:
120-6805 wilwood dynalites forged - lug mount
1.38/35.1mm bore, 1.00 / 25.4 discs width
both side are same code
172 disc Willwood calipers
For Williams clio / 16v clio
Caliper Billet Dynalite II
part number: 120-5322 left hand
part number: 120-5321 right hand
1.75/1.38 inch piston
1.00 inch disc
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bayliss calipers were initially bought for 172 so will be diffrent for the 172 discs...
There are a number of U.S. sites that offer a set for £150 new.