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The Polish 7TP tank is a kind of a hipster - started using a diesel engine before it was fashionable. Now the newest 1:35 model of it from IBG might use some corrections and this kit comes to help - it gives you (8x) new bogie springs with correct leaf spring width and correct swing arms under the springs and (36x) correct road wheels (4 spares to put on the fenders). The kit also has (4x) retainer clamps for the bogie axles (the kit ones are too small). In other words this kit replaces the IBG parts P1, P2, P5 and P10.