Whether or not these special SCK bulbs are required depend on your socket, specifically, the location of the ground terminals. We do not currently have all information in regards to the specific vehicle models requiring these bulbs. However, you can use the following information as a reference:
Possible Vehicles requiring special 3157-SRCK
(Red) bulbs,
NOT our 3157 bulbs:
1988-1999 (Old Body Style) Chevy and GMC full size trucks & SUVs
center tail lamp bulbs
(Our 3157 bulbs can be used for
top tail lamp bulbs)
1995-2001 Cavalier and Sunfire
tail lamp bulbs
1992-1998 Grand Am
tail lamp bulbs
2004-2007 Dodge Ram truck
tail lamp bulbs
Possible Vehicles requiring 3157-SACK
(Amber) bulbs,
NOT our 3157 bulbs:
Toyota Tundra
front turn signals
You can manually check your socket by comparing it to the following image: