Piston??

Hi Everybody,
Does anybody know where to get hold of a piston for a Eibar LI150 "Winter Model". I'm having a re-bore done, but so far any standard piston doesn't fit. I think the winter model barrel is shorter??. Any help is much appreciated. Thanks Alex.
Does anybody know where to get hold of a piston for a Eibar LI150 "Winter Model". I'm having a re-bore done, but so far any standard piston doesn't fit. I think the winter model barrel is shorter??. Any help is much appreciated. Thanks Alex.