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This motor mount for '78-'87 GM G-Body vehicles replaces GM part number 1258718 (right side). These are more commonly referred to as "Poly Motor Mounts", because they have Polyurethane bushings incorporated into their design. These new mounts have proven to be indestructible on engines making 1400+ HP, and are stronger than even the solid type mounts. The Poly mounts are designed to benefit the every-day driver as well as the full time racer, at any performance level.
For most street cars/daily drivers, upgrading the drivers side along with a stock GM passenger mount in very good condition will work fine.
For engines over approx. 500 HP, a pair is recommended for the best possible performance, as well as safety. If there is minimal clearance around the engine and excessive movement could cause problems, then a pair will also be much more helpful in keeping the motor in place. If an upgrade to a NON-Buick production 3.8 block is in your near future, it would be wise to consider the other version (aslo known as the 2nd design).