Hi mate,
I've got 2 Villiers MkIVA cylinders, 1 with piston. They dont have broken fins but are rusty, the one with the piston looks like the bore was greased. If your intrested I can check them out better and send photo's.
Unfortunatly this time last year I had loads of cruiser parts including an engine, damper bits, mudguards, petrol tank etc but no body needed them at the time so I put them on Ebay. Agh well!