Correct me if I'm wrong, but I don't think anything behind the front quarterpanels changed between 99 and 2010. I do remember reading about an 08 front end being swapped onto a 99 or so, with some minor modifications, but I'm prett sure they're very similar at the very least.
They look very close, but I'm noticing minor differences, and yes you will definitely have to change the inner structure for the front fenders. IE drill out spot welds and re weld on. Also the firewall where the wiring goes through is different so firewalls will need swapped from one to the other. Another thing I noticed (I'm part owner in a salvage yard I get to see alot of cool stuff ) is that the back glasses in the 99-07 were just held in with a gasket. the newer ones actually have glue in ones. Sucks for anyone that smashes one out Also sucks for me, I hate heating those things and pulling out of glue when we sell.
Oh yeah also the 08-10 cabs, although bolting down in nearly the same place bolt from the bottom up, so don't have to rip out carpet to get the cab off like on the old ones... There's the extend of my knowledge.
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