All right!
I've got one model that's 11 1/4 by 6 1/8 inch, and it's 2 1/2 inches thick. Model# 2-144
There's also 4 models that are 10 3/4 by 6 1/8, also 2 1/2 inches thick. Model 2-148, 2-205, 2-417 and 2-422. They're all for General Motors vehicule.
2-144
Buick: ELECTRA / PARK AVENUE / ULTRA / WILDCAT
1964
(that might be hard to find)
2-148
Buick: ELECTRA / PARK AVENUE / ULTRA / WILDCAT
1965 through 1970, w/o AC
Oldsmobile: Oldsmobile 88, Oldsmobile 98, Regency
1964
1965 through 1969, w/o AC
Pontiac: Bonneville
1963 through 1964, w/ AC
1963 through 1969, w/o AC
Pontiac: Grand Prix
1968
2-205
(there are no models linked to this one)
2-417
Chevrolet: Caprice / Impala
1962
2-422
Chevrolet: Caprice / Impala
1961
The Grand Prix was very popular, that's probably your best bet. The Caprice was a cop car, so that might be easy to find too.