Hi Mike;
The Early D-10 did have the Counter Weight on the End, later Mks; did not. As for the Tamiya kit, is it accurate for A early T-54.

Turret wise it may not, early T-54s had A Cut out rear Turret overhang. In any case your Legend detail set should be just fine. Have you tried A Google search on the T-54, if Not then it mite be of some Help !!
GOOD LUCK; MIKE.