The Disklok UK website specifically mentions the Ford Puma as one of the vehicles that its products are not compatible with, although it does not differentiate between the pre- and post-facelift versions of the Puma which used a different design of steering wheel, so it is still possible that a Disklok product may fit. One option would be to purchase from a store such as Halfords who should accept a return or exchange. If it doesn't fit go for a wheel lock with an adjustable bar rather than a disc which gives more flexibility in terms of fit - look at Stoplock or Milenco.