I noticed a new part turn up on the Farnell website, but there is little information on it, other than being an alternative for the Star Micronics MLT-03HH (250) ( 37960820 ) MLT-03HH (250) ( 37960820 ) buzzer.
The part number is MCSMT-8540B-K4083 MCSMT-8540B-K4083
Can you please post a datasheet if it is available?
Thanks
Paul.