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Search for vax upright wet and dry motors, looks identical ...
Is there the depth to fit one of these types? http://www.ebay.co.uk/itm/2-STAGE-WET-AND-DRY-1000W-MOTOR-VAX-101-VAX-111-VAX-121-TUB-VACUUM-CLEANER-/222650116520?epid=694710987&hash=item33d6fb29a8:g:r7YAAOxyOalTakDC
I fondle one here -
Also make sure it is a wet and dry motor, and not a dry only, although I think the holes in the fancase mean it is wet and dry/double insulated etc