Dynavector 501 repairs

I just recently picked up this arm, but it is missing the headshell and bottom plug which I am pretty sure is a 5 point din although I am not sure. Can anyone help me repairing this thing? or have a link to schematics? I am also curios as to opinions on this arm as the internet yields basically bupkiss. At least if I can't fix it, they are re-sellable. Thank you in advance for the help.