I had this problem with my 03. I never could figure out why I had a different mirror than everyone else...until I went to put the auto dim mirror on. My windshield mount was smaller than the auto dim's mount. Everyone told me the mounts were the same, but mine definetly was not, and found no way to switch them.
That pissed me off for over a year until I had to put a new windsield in the truck. The new windshield comes with a mount, but guess what, it didn't fit my stock mirror. Tried the auto dim, and it fit PERFECT. I have no clue why mine was different, but it was. I bet you got an "odd-ball" also.
03 Ranger XLT Super Cab, 4x4, 4.0L SOHC w/ auto, 4.10 rears, tow package.
Bama X-Cal 2, Roush Thunderbolt dual exhaust, Flex-a-lite tranny cooler e-fan, 200a alternator, Air Box mod, Fram Air Hog filter, JBA plug wires, Westin Ultimate Bull Bar, KC Slimlite fogs, Line-x bed liner, Ford Tonneau Cover, Expl. OHC & auto-dim mirror, Autometer pillar pod w/ Autometer oil pressure & tranny temp gauges, OEM fog switch for KCs.
My cardomain site