Hi and welcome,
If these are the parapull brakes - DA AX - brake shoes are available on ebay from a seller in the USA - if i find the link i will post it. An alternative is to cut down normal blocks - although i have yet to try this.
Edit -
http://www.ebay.co.uk/itm/321029312216? ... 170wt_1170and not USA!!!
Richard
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Built - Raleigh Rapide / Van Tuyl / Raleigh Ritmo / Forme Longcliffe / Will Cee Winter / Python Rock / Gazelle CM Mixte (aka Townsend) ///// Pending - Rossin Prestige Team / Gazelle CM A / Gazelle CM AB / Fulmar / Peugeot Sportive / Raleigh Flyer / Batavus Champion / Raleigh Flyer / Peugeot / Look 241 Kelme / Raleigh Pro Race