1990 or 2000 PUMA Equivalency Files

Is there any websites that provide the 1990 or 2000 PUMA Equivalency Files? I can only find the 2010 version on Census Bureau website. UM’s website does provide the data I need but the access to the data is restricted. Thanks in advance.

It sounds like the information on this forum question might be helpful to you. In short, The CONSPUMA variable bridges 1980, 1990, and 2000 PUMA definitions and might be helpful for your needs.