My old dad used to say, "Anything can be made to fit if you have the time and the patience." Do you have access to a welder? If so, cut off the parts of the seat downtube and skids that fit into the Mk2 runner, do the same with the MK1 and swap them with a weld. A bit of bending will be necessary but do it when the metal's hot to avoid cracking.
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