What front window regulators are compatible with that in a 1991 mercury grand marquis?

The front window regulators compatible with a 1991 Mercury Grand Marquis include those from various Ford models of the same era, such as the Ford Crown Victoria and Lincoln Town Car. Aftermarket options may also be available, so it's advisable to check compatibility with specific part numbers. Always verify fitment with a trusted auto parts supplier or mechanic to ensure proper installation.