2005 Silverado Keyless Entry

I just ordered and received my 2005 Silverado. I had to build up a base model because the LS decor no longer offers a V6 or a manual tranny (I'm the only one left in the world that likes the manual in a truck). I built up the base model with almost everything I could: Power everything, air, cruise, etc. My problem is that because it is a base model truck, it did not come with keyless entry (which sucks). I have the power locks and windows but no keyless entry. Is there a factory install for this, or do I have to go aftermarket with an alarm system? Thanks

I'm the only one left in the world that likes the manual in a truck

Nope, I know two other guys who do, but I'll be damned if I understand that.

Check out this thread on GM -TC (http://www.gm-trucks.com/forums/index.php?showtopic=43749&hl=)