all 4 bulbs work on every 99+ truck, I wasn't being negative at all just informing and giving an opinion. $40 is not a lot of money for doing the job right. I have had a 1999 RCSB with 03 Silvy tails and OEM harnesses and now my 2004 ECSB Sierra has 04 Silvy tails with OEM harnesses and both work perfectly with all 4 bulbs doing exactly what they do on 03+ silverados. Just a little info to try to help you sell your tails, no harm meant at all.

 

well my current 01 does not work, neither did my previous 01, it worked in an 02 i had
i bought one set with the harness long ago, then bought another set with cut harness' and was going to wire them but never did.....i have tried the harness believe me

 

bump, need to sell these
no more negative nancy's please

 

bump for $100

 

Least I learned something. And I must say I like the 03 lights better. nothing against the OP