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@gbj_tester
The Surly Fixxer kit contains everything you need (converter/axle/track nuts/spacers), but it only works on HED wheels with the black steel Shimano cassette body, pre-2007. Later wheels with an alloy cassette body use a different hub design and can't be converted.
If you're using a Fixxer, make sure you use a torque wrench to install the bolt, as it need to be properly tight. The bolt is the only thing keeping the two halves of the hub aligned, and the splines on the Fixxer are a slightly different shape from the splines on the hub shell, so the assembly process forges the two sets of splines into engagement. This takes a lot of force, and it's a once only deal. If you don't get it right, the Fixxer wobbles on the hub and the bearings go out of adjustment. Before assembly, make sure the centre bolt will go freely into the hub deep enough to get the two halves (Fixxer and hub shell) fully mated. The bolt seems to go further into the hub with a Fixxer than with the freehub body, and the hub shell threads may not be deep enough. If necessary, shorten the centre bolt by a couple of mm on a lathe.