I need a Thomson stem, 26.0 clamp. Thomson is biased to 25.4 or 31.8; apparently they'll make the X2 in a 26.0 clamp if the logistics align, but not anytime soon. The 26.0 was only made in the Elite and has since been discontinued. Not running 26.0 bars in a 31.8 clamp, so that's not an option.
26.0 is an old standard that wasn't around for long that's why it's hard to find 26.0 stems.
26.0 bars in a 31.8 clamp is your best option...or you can get some new bars. Period.