240 driveshaft front section differences

[oldschoolvolvo]

Curious if anyone has measurements on the length difference between the auto and M46 front driveshafts for a 240.

I found an old reddit thread that shows an AW7x at about 20" overall. Does anyone have a similar measurement for the M46 shaft?
The picture below looks like a 3-4" difference, but a more precise measurement would be appreciated.

 

[white855T]

M46 shaft is approximately 18"

 

[DET17]

I've got a front half M47 if you need that data (2 series).

 

[oldschoolvolvo]

Are the M46 front shafts always 1-3/4” diameter? Or are some 2” diameter?

In other words does a M46 front shaft with 1310 u-joints exist?