Adjusted to mod16,
1.85:1 (1/1.85=~37/20) would be either 880x480 or 896x480*
2.35:1 (1.2.35=~47/20) would be either 1120x480 or 1136x480**
*Actual is 888x480
**Actual is 1128x480
Usually though, 1.85:1 on DVD tends to be interchangeable with 16:9, as there tend not to be extravagant borders and the 16:9 anamorphic flag is still set.
What I would suggest concerning this would be this workflow:
A) Rip 2.35:1 movie.
B) Resize to 848x480 (since DVD only allows a 16:9 aspect flag even though MPEG-2 has one for 2.35:1 - which is why such movies are still letterboxed)
C) Crop the borders off using VDub's Null Transform filter.
D) Use the VDubMod Resize filter to scale the height up to 480, which also proportionally scales the width. You can optionally let it round to mod16 values as well. The value you want is the one furthest to the right in the filter's top bar.
Optional:
E) Use the Crop values and Resize values in a corresponding AviSynth script and bypass filtering in VDub.
The VDubMod Resize filter can be found here, and does not require being used in tandem with VDubMod (in other words, it works with vanilla VirtualDub too):
http://sourceforge.net/project/showfile ... _id=158229