Anyone carry a "temporary use spare" in their car?

One of the guys I know in Phoenix has one of those inflatable spares and the compressed air bottle for it mounted in the trunk of his Hemi Cuda.
I'm thinking of putting one in the well for my Dart, but I don't remember what it came out of.

His car doesn't have the well like some cars, so it works really well as a space saver.

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Nice, but that looks way to professional for me.. ha ha.
just want something that will fit in the well and not stick up above the well.
Didn't get to the yard last weekend, family obligations. Maybe this weekend.

And 72bluNblu, not worries about the exact height, since I don't have a suregrip. My current rear tires about 25", and that looks like what will fit in the well.