Reasonably sure they're the old metal Stormboyz (well, metal torsos and rokkits - standard plastic boyz bits otherwise).
Your local model shop will have kits of real-world aircraft rockets and missiles - some modellers have converted them into rokkit backpacks. Can be quite a bit of work though, once you add harnesses etc.
Or if you want something easier and don't mind the looted look, use GW marine jumppacks.
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