Donald. Ceramic disc lever type taps can be tricky to match up. There are different size splines and something that looks straight forward could leave you stratching your head!. If you can isolate the supplies and get the existing discs out you can take them to a plumbers merchants who May be able to help. But to save time and effort it may be best to post the job on ratedpeople,most plumbers would carry spares or know where to locate them quickly. May also be worth mentioning not all discs can be found and you could end up just replacing the taps. Hope this helps. Robert.