Help finding SKM brake caliber parts

Hallo Forum, i´m new here…

I have bought an old Gillard / P.D.B kart, for a project I have. (DIY electric gokart)
I want to renovate my braking caliber , but I have problems finding any info about it. Someone told me, that the SKM caliber isnt an original part on my gillard/pdb kart.
I have taken some pictures of the caliber. Anybody knows where to find spare parts, or what model its actually is ??? It is leaking from the bleed nipples :-/

The only thing I know, is that its a SKM / Intrepid caliber.