Difference In Length For Abs V. Non-Abs Housings

[sweefu]

Hey guys,
Would anyone know the difference in length between ABS and non-ABS diff housings? For R33.
I know the non-ABS is shorter but I can't seem to find by how much, the best measurement I've found so far is 'about an inch' - would anyone know the exact measurement?
Alternatively, does anyone have a non-ABS diff spare they could measure? I have an ABS diff in my car so could measure that length.

Cheers.

[sweefu]

I measured some diff centres at my friend's house,

Non-ABS is 10mm shorter than ABS, not including different rear covers.
I measured the front off the diff only, to the middle where the rear cover bolts on.