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Found this, maybe it will help you:

Info - Daytime Running Lamp (DRL) Bulb Replacement #00-08-42-010A - (06/20/2003)

Daytime Running Lamp (DRL) Bulb Replacement

2002-2003 Cadillac Escalade, Escalade EXT
2003 Cadillac Escalade ESV
1999-2003 Chevrolet Silverado Pickup Models
2000-2003 Chevrolet Tahoe, Suburban
2002-2003 Chevrolet Avalanche
1999-2003 GMC Sierra Pickup Models
2000-2003 GMC Yukon, Yukon XL
2001-2003 GMC Denali, Denali XL

This bulletin is to announce availability of new DRL bulb part number.

A new 14 volt DRL bulb, P/N 15199562 (trade bulb #4114K), is now available for use whenever a DRL lamp bulb on the above listed vehicles requires replacement. This more robust, higher voltage DRL bulb replaces P/N 1999482 (trade bulb #4157K). These bulbs should be replaced in pairs for customer satisfaction.

Parts Information

Part Number 15199562
Bulb, Daytime Running Lamp

Parts are expected to be available 6-27-2003 from GMSPO.

Maybe not, I just saw you are already using this bulb. Sorry.

4,151 Posts
Those look hot! I installed the amber DTR lights on my Wife's 2001 Suburban and it stands out from all the rest. I do like the white though:great:
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