You could try Harpers on 01923 260299 their Part Number is FUL270 if the unit has screw hole fitting. Heart of England Morgans on 01299 250141 are excellent for spares also.
Melvyn Rutter is another supplier of parts although I have had no dealings with him. Harpers and HOE I have and found them most helpful. I hope this resolves query for you.
All these suppliers are on the web, if you have difficulty locating the sites I will send the links.
Good Luck Paul.
