Drty,
I gave up on the idea of using the 2005 antenna, as the connectors are completely different. Therefore, I used the XM antenna in the GM Kit, drilling 5/8" and 3/16" holes in the roof to mount the antenna.
From GMPartsDirect:
GM PART # 12498768
CATEGORY: All
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $397.14
OUR PRICE: $333.60
DESCRIPTION: Add on XM player for 2003-2004 trucks
Installing the antenna in the kit on 2003s with sunroofs may be a problem. 2004s and later should be a piece of cake, as the XM antenna can be installed where the AM/FM antenna is installed on the 2003s. The problem is with the reinforcing areas on the underside of the roof. It limits where the kit's antenna can be mounted. However, the antenna connector on the XM Tuner Module is standard, so a small stick-on aftermarket antenna could be used.
I took a bunch of pictures, and will work on an install doc in the next day or two.
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