SEM ZL30F-1 Spare Parts

Hi all,
I have been searching for parts online for my father for an SEM ZL30F-1. It appears that spare parts for this model are not readily available, and I have no idea what other SEM models would have the same parts. There may even be Caterpillar models which have the same parts, but again, I have no idea. So, I would be extremely grateful if someone could send me in the right direction. These are the descriptions of the parts my father wants:

Dead man switch for breaking system
Activator...

SEM ZL30F-1 Spare Parts

SEM ZL30F-1 Spare Parts