Wheel clamp for Sandhurst alloys

I've got a couple of wheel locks/clamps but neither will fit due the concave shape of the Sandhurst's alloys.

Any recommendations for something that'll do the job? 

Thanks

I think its going to be Try before you Buy with having the Alloys

I've got a Milenco Compact wheelclamp on my alloy. 
Don't know if this helps if you have concave wheels.

I’ve got the same Milenco Compact which I’ve used for 3 years on my Eriba caravan and now using on the Symbol.
Nice quality compact lock but also can’t say if it will fit your wheels.
Sorry, no help whatsoever!!!

Hi, I know it's been a while, but I've bought a SAS defender clamp as it's adjustable to fit if you haven't found one yet, it fits well but quite bulky, only use whilst parked up at home
  Matt

The O/P hasn’t been on the forum for nearly 2 years but I’m sure your info will help others