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Glad I did, although the T-54/54A and T-55 are basically the same kit. The each kit comes with two upper turret halves and you use whichever one is called for in the instructions.
The KV-1E was bid on since it ended up being a whopping $1.25 and would only add 25¢ to the total shipping ($5 for 1st kit, 25¢/additional kit). The majority of this kit is molded in the same bright green that the T-54/55 are but the up armored KV-1E turret is molded in a dark gray. I think I'll build this one first.
I bought these through Alanger out of Massachusetts. Three 1/72 scale armor kits for $15 or so isn't too shabby.