WTD: Rear Hope M4 / Mini brake (or a working El Camino)

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I did intend to rejuvinate a set of El Caminos that I bought on here, but sadly parts are no longer available, so option two fpr my P1....

Does anyone have an original rear Mini or M4 brake that they may wish to part with?

Failing that, a working El Camino would also be of interest.

Cheers