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you got it Brian the only thing is that the those side rails go straight back and butt upagainst the bustle rack like on the M1A1 and M1A2
Nope. Or rather: it depends.
Early M1IP tanks had rails exactly like in Brian's model. Only later they were changed to straight back type.
Interesting thing is that actually late production M1s had the rails already straight and bustle rack factory added. My guess is that the change of rail design came after the first batch of larger M1IP turrets was already manufactured (so hey retained the original design of the rail back end), but when original M1s (w/smaller turret) were also still in production.