2 questions

1) What is your source for the backbox lamp sockets? I've had a tough time finding them!

2) Did you just screw the line cord cover over the factory power cord hole, or did you install the internal bits from a newer game, too?

John i had the same problem finally rang Mark C at pinball spare parts and he found 50 out back and listed them for me .
http://www.pinballspareparts.com.au/index.php?crn=244&rn=2945&action=show_detail
The line cord cover is straight over the flexible cable creating a tortuous path for the flex.