I have used the coil spring compressors as track jacks before, but often as not you end up bending them. The best rack jack is to get a surplus one from a M113 and grind down the hooks so they fit into the carrier track. There is incredible power in those track jacks. That way, when you do find an original track jack, you don't end up breaking the hooks off it (and they do break).
Be prepared to cut a few cork O rings for the sealing of the bearings. These are often cracked and shrunk so bad they have little usefullness left to them. I went with actual conventional seals on mine, but, besides being expensive, may have been a bit of overkill.
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