'65 8-3/4 and 904 Trans, Driveshaft Length?

I have the rear in. I bought what I thought was the right drive shaft online to match up with my 904. NOT

It's way short.
I have another drive shaft from a parts car, and it's a different length still.....

Does anyone have a spec on what I need? I'd like to drop off my drive shaft to get cut/shortened without towing the car down there....

thanks!


1965 Dart had 111" wheelbase, what 1965 are you working on? Valiants only had 106" wheelbase.