They may come apart, though they take some persuasion.
Two questions: are they non-adjustable Marzocchi? That’s probably what they had when they left the factory, but people swap things.
What are the bolt centres on the front brake caliper mounts?
https://www.ebay.co.uk/itm/274830447...3ABFBMyPLR8Zhf
It may be a good time to talk to someone like Maxton to get the damping sorted to suit your weight too:
https://www.maxtonsuspension.co.uk/f...onversions.htm