Monroe offers both, the strut mount and the Reflex strut. They work very well on the Buick. Reflex struts average about 70 bucks each and the strut mount assembly, about 40-50 bucks each. You can have Monroe Sensa Trac struts installed at Pep Boys or Sears & Roebuck, or you can purchase them at the following parts supply stores and have your trusted front-end mechanic install them. (Recommended) You would need to have the car aligned anyway!
O'Reilly Auto Parts
Advance Auto Parts
RockAuto Parts Catalog