Looking for rocking horse shit

As the headline suggests . Im looking for a hard to locate item .

Its a marlin model 62 levermatic magazine in 256 win mag . Have seen that you can use a m1 carbine magazine and alter the feed lips . Any help would be greatly appreciated. And happy to pay top dollar if anyone has one laying around . Cheers and enjoy . Obviously not a m1 carbine magazine. Just looking for the model62 mag in either 30 cal or 256