This part, in the red circle:
The front is more or less in the correct position, but it should be rotated a bit so it’s oriented fore-and-aft rather than diagonally. You would really want to drill the whole thing out at a 45-degree angle into the turret, because the hole is for the barrel of the 2-inch bomb thrower that was fixed at that angle:
But as I said, it was not necessarily present on Crabs — “mine” didn’t, for example — so you can also just cut it off the turret again. The hole should be 1.5 mm, BTW, not 3 mm.
As for tracks, the Asuka Sherman V kit has soft plastic tracks in two pieces, which should be the correct length for your model. Anyone who has one of those kits but replaced the tracks should have a set they might be willing to send you (I’d offer to send you the ones I had left, except I already gave them away some time ago).
If the box is absent, check if there are remains of deep-wading gear on the tank. Using another Sherman V from my area as an example, the bits marked with arrows are all related to the wading gear, which often remained for a while after landing — until the crew had time to properly remove all of it:
- Yellow indicates the air exit chute, which is easily visible in any photo from the rear if it’s still present.
- Blue is the release gear (to which the intake and exhaust ducts were connected by cables or tie rods, so they could be released from inside the turret), which sits on a little bracket on the rear roof of the turret so that it’s almost horizontal. The Dragon kit doesn’t have that part, AFAIK, but it was present on all or nearly all British Shermans, and the bracket stayed on the tank after the gear itself was taken off.
- Red is the base for the air inlet duct. It’s the rectangular bit in front of the normal “hump” in the engine deck with the radiator filler cap, and it sat on top of the grille in front of that hump.
If you can see any of these items in a photo, you know the tank had recently had deep-wading equipment fitted. And that explains why it won’t have a stowage box on the back of the turret, because the air inlet duct is this close to the rear of the turret:
In the photo of the real tank above, you can also see the brackets that held the stowage box on, BTW: a horizontal piece of angle iron near the bottom edge of the bustle and a bit of strip high up on on each side of the bustle.
The Crab in the background of that photo, behind the petrol pump, is the one whose photo was posted earlier in this thread, by the houses. It’s in the exact same spot here as in that photo.
The rack on the side is different than any in Infatuate, it’s lacking the lane marker boxes that all but one of the Infatuate Crabs had, there’s a machine gun on the commander’s cupola that none of them had, etc. 
