Hi, the casing on my alarm fob has out lived its life haha

I found out it's made by a company called "Conalog" that went bust
Heres a Pic
It's for my Golf MK3 Cabrio.....
Does any one know where i can get a replacement case or any other casing that would fit?
The remote itself is in working order

Thanks so much for any help as i cant find a thing.
Matt.