You can try contacting zalman. But they’d have to know your model number. I know several of them do have brackets for 1151 and 775 but if yours is an older model that was never intended for 1151 they wouldn’t have a bracket available. If the cooler has been with that board since it was new that cooler probably won’t have an 1151 bracket available.
But i could be wrong. Their cooler designs are fairly simple so the brackets could be all interchangeable. Best bet is to try and contact them.