Riggen had been making wheels and tires since at least as far back as late 1964 (their first ad in MC&T was in the January 1965 issue) when they decided to begin offering "Ready-to-Run" cars in 1967. Riggen called these R-T-R cars their "JAD" series, and going one better than most other R-T-R manufacturers, they decided to make their own bodies instead of using someone else's. So, they engaged the services of a designer named Gordon Brimhall to fabricate custom molds for them.
In all, Brimhall produced six molds for the Riggen JAD series, two open wheel (one GP and one Indy), two sports cars and two coupes. One of the coupes was a Thingie called the "Riggen Special".
Riggen actively sold these R-T-R cars through the end of 1968 (their last ad featuring JAD cars was in the October 1968 issue of Car Model). After October 1968 Riggen stopped advertising in Car Model for a full year (MC&T was already defunct), and when they began advertising again in October 1969, the JAD cars were gone and the product line was completely different, featuring NNC Group 12 cars.