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Yeah I know for a fact it won't fit.
I measured because I had it and wanted it in the K5.
Now I am putting it in a long bed, I didn't measure yet but I believe it should fit.
There are larger aftermarket gas tanks for the Blazer -- Northwest Metal Products I believe is the name of the big 'un, ~40gal, and our very own Desert Rat here has done the install. Search on it.