No. Some of the initial information incorrectly stated that the 180MHz Processor Upgrade Card was for "Power Macintosh 8500 series." However, the Power Macintosh 180MHz Processor Upgrade Card (M5458LL/A) is supported in the Power Macintosh 7500, 7600, 8500 and 9500 series.
Part numbers mentioned in this article are accurate as of this writing. Before ordering, verify that they are still correct as they are subject to change.