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Webby,
If you're interested, I have a Curt hitch (13445) I had on my 06 4runner for less than a year. I actually just put on a factory hitch. Wish I had known you were getting rid of yours. We could have traded. I only used the Curt hitch for my bike rack. Let me know if you're interested.
My 4runner did not have a hitch on it originally and came with the bumper w/o the hitch cutout. Because it didn't have the hitch cutout, I put on the Curt hitch because of the lack of any modifications needed. Worked fine, but I prefer the clean factory look to the aftermarket look. So when my rear bumper was damaged and needed to be replaced, I replaced it with the factory bumper with the hitch cutout and installed the factory hitch.
No valid reason for switching the hitch other than aesthetics. And again, that's just personal taste.
As far as the Curt hitch goes, bolts to the frame on each side of the spare tire. Holes I believe are already predrilled on frame. Just bolts on. There's a Curt hitch string on the Accessories page that shows a pic of one installed on a 4runner. Mine looked identical, except that I removed the Curt decal so it is solid black.
I live in Louisiana and was selling for $100 for pick up only. I guess that I can ship it, but I'm not sure how much it would cost to ship. That might change the price somewhat depending on how much it would cost. It's pretty heavy and bulky. I'll have to look into that.