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There were several successful attempts to build a convertible ZR-1, most of them by private people. The DR-1 was a GM prototype to test the structural integrity of the ZR-1 chassis when it would be topless. The car was built by American Sunroof Corporation (ASC) for Don Runkle, who was the vice-president of Advanced Engineering Staff, which explains the “DR-1” designation. It was a standard convertible transformed to ZR-1 specs.
2008 Corvette Daytona Pace Car
With defending Daytona 500 Champion Kevin Harvick at the unveiling, surrounded by Chevrolet, General Motors and Daytona International Speedway officials, hundreds watched the much-anticipated unveiling of the 2008 Corvette Z06 Daytona 500 Pace Car ~ the Official Pace Car of The Daytona 500, NASCAR's biggest race. Apart from its special paint and the addition of a integrated light bar, it is almost identical to the street version.
The 1978 Silver Anniversary Edition Corvette was developed to offer consumers a “collectible” model that commemorated one of Corvette’s milestone production anniversaries (its twenty-fifth anniversary in this case) in a way that had ever been done previously with any Corvette model year that had come before it. The car was mechanically identical to 1978 counterparts.
The Chevrolet Corvette has served as the official pace car of the Indy 500 18 times since 1978. That accounts for half of the 32 times that Chevrolet has been given the honor since 1948, which only highlights the sports car’s endearing legacy. Interestingly enough, this C8 Corvette convertible is the first Indy 500 pace car to have a drop-top since the 2011 Chevrolet Camaro.
The early C4's had their problems, what with the 1984 Cross-Fire Injection and its unusual 4+3 manual transmission. By the late 1980's, the fourth-generation Corvette had evolved into a more desirable automobile, thanks in part to the arrival of the ZR-1. 
Priced at an additional $3250  for the coupe or an additional $2880 for the convertible, the Grand Sport package included exclusive Admiral Blue paint and featured a single white stripe that ran the length of the body as well as two red accent stripes (also known as “Sebring Stripes”) on the driver side front fender.  This unique paint scheme was deliberately developed by GM to pay homage to the classic Corvette Grand Sport Racer of the 1960’s.
Two racing icons will unite when Lance Armstrong, seven-time Tour de France winner, drives the 2006 Chevrolet Corvette Z06 pace car to lead the field to the start of the 90th running of the Indianapolis 500 on May 28, 2006. For a record 17th time, a Chevy will pace the race, and it's the eighth time for a Corvette to be leading the pack. The only changes made to prepare it for this year's role were the addition of strobe lights and racing safety gear.