tried to put my stock driveshaft back in the car but it seems juuussst a fraction too long. Tried to move the rearend up and down with the jack to see if it gave me anything but nada...it's a manual with a Moser 12 bolt if that makes a difference...solutions?

 

Yeah with a Moser it will be slightly too long. Solutions include adjustable torque arm and adjustable LCAs so you can just move it back. Or shorten your driveshaft. I'm not sure if there is another solution out there - maybe someone will offer one...

The stock length will fit but it will be harder to get in and out and it won't have the desired end play for clearance. If the yoke is positioned just right you will be able to get it in.