Mickey Thompson Drag Radial Actual Dimensions

I have the M/T ET Street S/S P295/55R15 mounted on an 8" wide rim. They're pretty close to 12" wide if you lay them down and put a straight-edge across them like in your picture. They actually came out right about at the specs they list on their website.
I use them when the car is street-driven.

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I’ve got 8” wide rims as well. I know the 275/60’s are the better fit for them, but the 295/55’s would work. I’d prefer their slightly lower profile if I can fit them. Any pics of the sidewall bulge showing some of the rim? And how much tread do you reckon is making contact on pavement? (assuming you are running them now)