10.5" Big block Bellhousing differences!

[Scott's dart]

I was just wondering if the only difference between 10.5" big block bellhousings for different makes of car is where the clutch linkage is? Or are the ones from other cars physically bigger that they won't fit in the tunnel? The clutch linkage location doesn't matter to me because I have a hydraulic clutch and the only bellhousing left in stock at Brewer's is for a B body!

 

[Oldmanmopar]

The bearing retainer hole for a 18 spline is larger then a 23 spline.

 

[Scott's dart]

The bearing retainer hole for a 18 spline is larger then a 23 spline.

The bellhousing I'm looking at has the smaller retainer size so that part is correct! Would that be the only place there could be a difference?