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I would recommend the external stick-on type, if you ever think you'll remove them later. I bought a Nissan truck used once, years ago, and it had the Ventshade brand slide-in shades...the kind that slid into the window channel. Nice clean installation, but I tried removing them once and the extra width of the shade/glass opened the window channel up a bit, and there was a bad wind roar/leak...so I had to put them back in.
i got mine at advance auto parts...any parts store has them or can order them. any online parts sites have them in any name brand, just search for them online