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I did some measuring for you.... Sadly, I only have a set of the early style 12-bolt rims here. They are the ones good for 3400 lbs, with no centering hole. (P/n of the inner section is 12342642, to be used with the 12342640 outer half.) FWIW, on those, the ID of the cylindrical portion in question measures 395.0mm (+/- 0.5mm), with the point of measurement being 5.0" inwards from the inner rim edge, shortly before it starts reducing with a radius of +/-16mm....... I still do need that inside dimension of the back side of the rim, so if anyone can help out with that, much appreciated!!
Measuring this accurately is a bit of a guesswork, since most of these parts are not perfectly round, as previously stated.
Interestingly, the (average) ID of the load range E (paired)24-bolts is only maybe 0.5mm less, measured at the same point; even if those wheels are said to be built much stronger. So we can assume that the later style 12-bolt inner rims (#12460177) are not much different in size and shape, in that particular area.