I was on the pinball life site and saw three different kits for Williams in the 90's. I was just a little confused on what was different about them. Is it just the part number Williams/Bally used during this time? pinball resource only has one kit for this time.
02/1992-04/1993
http://www.pinballlife.com/index.php?p=product&id=983
08/1993-10/1998
http://www.pinballlife.com/index.php?p=product&id=244
01/1999-06/1999
http://www.pinballlife.com/index.php?p=product&id=978