Good point, the 11" brakes came in 2", 2.5", and 3". The 2" and 3" wide versions are harder to find drums and shoes for, but the hardware is the same.
Believe it or not, the 11" drums were used up to 1995 as an option on some of the Grand Caravans, Voyagers and Town & Country's. You can also get 11x2.5" backing plates from a lot of trucks and vans all the way up to 1998, but the bolt pattern on the drums is wrong. Still, it's easy enough to pull the 11" backing plates and hardware at the yard and just buy new drums with the correct pattern.
Here's a list of all the vehicles that came with 11x2.5" drums with the correct 5x4.5" pattern. They were an option of some of these cars, so not every one at the yard will have them. The list gets even longer if you just want the backing plates, because they came on a lot of the 150's, 250's, 1500's, and even 2500's up to 1998.
CHRYSLER 300 (1966 - 1971)
CHRYSLER CORDOBA (1975 - 1982)
CHRYSLER FIFTH AVENUE (1983 - 1989)
CHRYSLER IMPERIAL 1974
CHRYSLER LEBARON 1981
CHRYSLER NEW YORKER (1966 - 1982)
CHRYSLER NEWPORT (1966 - 1981)
CHRYSLER TOWN & COUNTRY (1966 - 1995)
DODGE ASPEN (1976 - 1980 )
DODGE B100 (1971 - 1980 )
DODGE B150 (1981 - 1984)
DODGE B200 (1971 - 1980)
DODGE B250 (1981 - 1984)
DODGE CARAVAN (1991 - 1993)
DODGE CHALLENGER (1970 - 1972)
DODGE CHARGER (1970 - 1978 )
DODGE CORONET (1970 - 1976)
DODGE D100 PICKUP (1972 - 1979)
DODGE D150 PICKUP (1977 - 1984)
DODGE DIPLOMAT (1981 - 1989)
DODGE GRAND CARAVAN (1991 - 1995)
DODGE MAGNUM (1978 - 1979)
DODGE MIRADA (1980 - 1983)
DODGE MONACO (1969 - 1978 )
DODGE POLARA (1969 - 1973)
DODGE RAMCHARGER (1974 - 1984)
DODGE ROYAL MONACO (1975 - 1977)
DODGE ST. REGIS (1979 - 1981)
DODGE W100 PICKUP (1974 - 1977)
DODGE W150 PICKUP (1977 - 1983)
FARGO B100 VAN 1972
FARGO B200 VAN (1971 - 1972)
FARGO D100 PICKUP 1972
FARGO D110 PICKUP 1972
PLYMOUTH BARRACUDA (1970 - 1974)
PLYMOUTH BARRACUDA GRAN COUPE (1970 - 1971)
PLYMOUTH BELVEDERE 1970
PLYMOUTH BELVEDERE SATELLITE (1970 - 1971)
PLYMOUTH CARAVELLE (1978 - 1988 )
PLYMOUTH CARAVELLE SALON (1980 - 1988 )
PLYMOUTH CARAVELLE SE 1985
PLYMOUTH CUDA (1970 - 1974)
PLYMOUTH FURY (1975 - 1978 )
PLYMOUTH FURY CUSTOM (1971 - 1975)
PLYMOUTH FURY CUSTOM SUBURBAN (1970 - 1975)
PLYMOUTH FURY GRAN COUPE 1972
PLYMOUTH FURY GT 1970
PLYMOUTH FURY I (1969 - 1974)
PLYMOUTH FURY II (1969 - 1974)
PLYMOUTH FURY III (1969 - 1974)
PLYMOUTH FURY POLICE 1974
PLYMOUTH FURY SALON (1977 - 1978 )
PLYMOUTH FURY SPORT (1969 - 1978 )
PLYMOUTH FURY SPORT GT (1970 - 1971)
PLYMOUTH FURY SPORT SUBURBAN (1970 - 1978 )
PLYMOUTH FURY SUBURBAN (1970 - 1978 )
PLYMOUTH FURY VIP 1969
PLYMOUTH GRAN FURY (1972 - 1989)
PLYMOUTH GRAN FURY BROUGHAM (1975 - 1977)
PLYMOUTH GRAN FURY CUSTOM (1975 - 1976)
PLYMOUTH GRAN FURY CUSTOM SUBURBAN (1975 - 1976)
PLYMOUTH GRAN FURY SALON 1980
PLYMOUTH GRAN FURY SPORT SUBURBAN (1975 - 1977)
PLYMOUTH GRAN FURY SUBURBAN (1975 - 1977)
PLYMOUTH GRAND VOYAGER (1992 - 1994)
PLYMOUTH GRAND VOYAGER LE (1991 - 1995)
PLYMOUTH GRAND VOYAGER SE (1991 - 1994)
PLYMOUTH GTX 1970
PLYMOUTH PB100 VOYAGER (1974 - 1980 )
PLYMOUTH PB150 VOYAGER (1981 - 1983)
PLYMOUTH PB200 VAN VOYAGER 1974
PLYMOUTH PB200 VAN VOYAGER EX WAGON 1974
PLYMOUTH PB200 VOYAGER (1974 - 1980)
PLYMOUTH PB200 VOYAGER EX WAGON (1974 - 1977)
PLYMOUTH PB200 VOYAGER MX WAGON (1978 - 1980 )
PLYMOUTH PB250 VOYAGER (1981 - 1983)
PLYMOUTH ROADRUNNER (1970 - 1974)
PLYMOUTH SATELLITE (1970 - 1974)
PLYMOUTH SATELLITE BROUGHAM 1971
PLYMOUTH SATELLITE CUSTOM (1971 - 1974)
PLYMOUTH SATELLITE REGENT (1971 - 1974)
PLYMOUTH SATELLITE SEBRING (1971 - 1974)
PLYMOUTH SATELLITE SEBRING PLUS (1971 - 1974)
PLYMOUTH SATELLITE SPORT 1970
PLYMOUTH SUPERBIRD 1970
PLYMOUTH TRAILDUSTER (1975 - 1979)
PLYMOUTH VOLARE (1976 - 1980)
PLYMOUTH VOLARE CUSTOM (1976 - 1977)
PLYMOUTH VOLARE PREMIER (1976 - 1977)
PLYMOUTH VOYAGER 1992
PLYMOUTH VOYAGER LE (1992 - 1993)
PLYMOUTH VOYAGER SE (1992 - 1995)
