I had to look the Spike up, but I was reminded that I had seen one of these roomy little vehicles before - as a disabled conversion.
The caliper you have there certainly looks like the Jazz/Civic part, googling the Nissin number seems to concur.
The common issue with these calipers is the pads binding in the carriers, it's worth removing everything including the anti-rattle shims and sliders, making sure every bit of corrosion is removed from the casting before reassembly. If the piston is seizing in the bore, you are better off fitting a new pattern caliper.
I fitted a pair to the old Jazz without any problems, it's not worth messing about with seal & piston kits at the price you can buy a complete caliper, something like this
https://www.ebay.co.uk/itm/174128795131