You didn't specify what year it is, but most likely the rear taillights are #1157 or #2057. Both are interchangeable.
'04 K3500 Silverado LS with LS3 Connect & Cruise- with Intimidator SSI PKG- Reprogrammed 4L80E
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"