what flywheel for a 273 128 tooth. with a 360 bellhousing

MOPAROFFICIAL said

Use a flywheel from a later 318/340
Which is a 10.5 flywheel that's neutral balance.
360/340/318 bellhousing will work fine with a 273. What year car is another story.. wont fit in a 66 or earlier.

360 flywheels will not work, they are external balance.

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I just measured the flywheel from my 1965 Dart 273 three speed manual, and it is 11.5" in diameter (excluding the ring gear teeth), while the clutch disc is 10.0".

Did I measure correctly? Where are you guys getting the 10.5" from? Is that a different size FW?