I talked to the previous owner (since im new to the 510 scene) he said he thinks its a stock driveshaft but shortened by 2 inches because the motor in it is a CA20e.
it didnt break at the U joint, the bolts just rattled out or something, broke out swung around and got all bent up, even snapped my rear brake line=p.
sorry heinz, i planned on calling you but i havent really been mobile since this, been driving my parents car around haha.