Rattly floating discs

[Singh911]

A good few years ago, i had the mk2 brake caliper conversion done on my mk1 gt3 along with the brembo floating discs. I'm not sure if its just middle age but i think the rattles are getting louder. Had the car serviced recently and the discs and pads are fine.
Is there a cure for the increasingly rattly discs or do they all go this way. I thought maybe renew the fixing kit/bobbins? Is this easy to do/cheap?

Cheers