Sony MD machines use a 1.0mm pitch FFC cable between the main PCB and the MDM.
eBay seller (UK) (As of Mar/2020 they are around 2GBP per 2 pieces from China)
ETA (Oct/2020):
Above link is broken. Seller in UK is hkdz-2017: http://www.ebay.co.uk/usr/hkdz-2017?_trksid=p2057872.m2749.l2754
This is his shop, searched for FFC 1.0mm: https://www.ebay.co.uk/str/hkdz2017?_bkw=ffc+1.0mm
If the size you want isn't listed, ask him - some of the sizes I wanted I couldn't fin