Where can i get replacement key fobs for my micromark home alarm?

Where can i get replacement key fobs for my micromark home alarm now Micromark have gone bust. Tried the obvious google searches but turned nothing up and as the alarm can be part set at night the only way to get down stairs is to use the remot fob to turn it off. If I cant get spares then I will end up replacing the whole system and as i fitted it 20 years ago it is only just run in LoL!!!! seriously it works well all but the fobs go down, I have repaired 2 and they are the last ones if they go.... well i'll have no option but replace the system so any ideas who might have some fobs the part number is mm23006 white singe button wireless key chain fob.
Thanks

Marconi