best bet is a junk yard you can get them off any of these cars the plug is all the same

1986 - 1991 AEROSTAR
1987 - 1990 F-250 PICKUP

1987 - 1990 BRONCO
1987 - 1989 F-350 PICKUP

1987 - 1990 BRONCO II
1988 - 1989 F53 STRIPPED CHASSIS

1987 - 1991 COUNTRY SQUIRE
1987 - 1991 LTD CROWN VICTORIA

1987 - 1990 E-150 ECONOLINE
1987 - 1993 MUSTANG

1987 - 1990 E-250 ECONOLINE
1990 - 1992 PROBE

1987 - 1990 E-350 ECONOLINE
1987 - 1989 RANGER

1987 - 1991 ESCORT
1987 - 1995 TAURUS

1994 ESCORT
1987 - 1991 TEMPO

1987 - 1988 EXP
1987 - 1990 THUNDERBIRD

1987 - 1990 F-150 PICKUP