For sale at auction: Lot #312 - 1973 Buick Riviera Grand Sport Stage 1 in superb condition. Rarely does an opportunity come along like this one. This is a very rare Riviera GS Stage 1 car in white with white leather seats. This car comes with 6-way power seats, large factory moonroof, power antenna, cruise control, automatic climate control with temperature select, factory chrome wheels with "R" on the center and the very rare Stage 1 package. A beautiful white leather interior in great condition is matched by the era correct, very high quality white repaint a few years back. The Stage 1 package upgrades the GS with a 455cid engine with dual exhausts, posi-traction and sway control bars. 1973 was the last year for the signature boattail rear end which sets this car apart from all the others. When you combine the rare facts of the boattail, Grand Sport option, Stage 1 package, factory moonroof, superb condition with the bonus feature that this car was ordered by and delivered to the GM Technical Staff at the Michigan GM Technical Center, you can see this car is very unique and desirable.