J type sliding doors on e-bay.

Morris j type front cab doors in good condition for there age require a bit of work but nothing to major these kind of items are rare and extremely hard to come across so grab a bargain whilst you can
http://www.ebay.co.uk/itm/Morris-J-type-van-front-doors-/151018097390?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2329614aee

Well worth buying I would say, item located Cheshire.