Oh, OK.
In that case, 265/70-17 are stock size (-0.1% difference from the 265/75-16 that is stock on your truck). The only other real option to keep it close would be a 285/65-17.
I've been playing around with the tire size calculator over on the Miata forum (the one Stickied in the tires section on here).
Specification__Sidewall__Radius__Diameter__Circumference__Revs/Mile__Difference
265/75-16.......7.8in.........15.8in.....31.6in.........99.4in................637.............0.0%
265/70-17___7.3in_____15.8in___31.6in____99.3in________638_______-0.1%
285/70-17.......7.9in.........16.4in.....32.7in.........102.8in..............617.............3.3%
285/65-17___7.3in_____15.8in___31.6in____99.2in________639_______-0.2%
295/65-17.......7.5in.........16.0in.....32.1in.........100.8in..............628.............1.4%
305/60-17___7.2in_____15.7in___31.4in____98.7in________642_______-0.8%
305/65-17.......7.8in.........16.3in.....32.6in.........102.4in..............618.............3.0%
315/60-17___7.4in_____15.9in___31.9in____100.2in_______633_______0.7%
I was thinking of going with a 285/70-17, but then my spare wouldn't match and a set would be $120 more, so I'm sticking with a 265/70-17.