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GW sell a Crusader/Redeemer upgrade kit, so buying that with the stock LR will let you field all three of the main variants. Whether you would need another set of sponson housings depends entirely on how you magnetize. Personally, I would magnetize each weapon option to sit within a single, permanent housing, but it seems that I'm in the minority (did the same with my Predator - magnetized the weapons and ammo packs, themselves, so a single turret/sponson set covers every playable combination). Magnetizing the entire sponson is easier, of course, and would allow you to move them fore/aft on the model (if you also magnetize the doors), but requires a bigger bits box than I had or a separate purchase.