1996 Buick Riviera Engine Mount

There were never any aftermarket ones made for the passenger side torque mount. Different mount than Regal Bonneville or Park Ave. Best bet is a lower mileage or wrecked junkyard car or pull the mount and repour using urethane of whatever firmness you want. *warning stiffer isn't always better, it will transmit every vibration to the chassis and hence to you driving it. just use a softer urethane IMO.

PS ~ check all the other mounts as well and replace them all at once.