That's good thinking, NISMO. Since I don't think any S12's came with tinted windows, putting the stickers on the inside should work fine. If you think about it, it should just be a matter of having them printed backwards (mirror image).
Oh and any decent decal shop will have NO trouble cutting that out at all. They all use computer-controlled cutters now, they look like big printers but with cutting blades instead of inkjets. Back when I had my Dakota I walked into one of those shops and had them cut a Dodge Ram-head logo, in red, in the size I wanted...(it was like 12"x12"..bigger than we're talking about)...as I recall it took about 10 minutes and cost 15 or 20 bucks. The detail on the decal was outstanding, and now that I think about it, that was on the outside of the back window and two years later when I sold the truck it still looked great. The unique airflow characteristics of a pickup might have helped though....that back window never got dirty or even wet in the rain.
I think a lot of the stickers you see that are peeling off are cheaper than what the decal places are using. As long as you don't hit it with an ice scraper, it should last a good long time. Unlike the Ichibahn stickers I got with my shift knob and boot. They're starting to peel.
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