it will fit but will be a little long

Joe - this would fit both a 19 and a 26. it would work for a 26 because the holster fits the 'shape' of the pistol frame, not necessarily the length of the barrel. The 26 mid-frame area is the same basic size as the 19, (the grip and the barrel are shorter) and since the trigger guard is actually what actually stops the pistol from going too deep into the holster, the slightly shorter barrel wouldn't be a problem actually. The holster would accommodate the slightly longer barrel of the 19 just fine.. The holster features a 'tension adjustment' screw - located just behind where the trigger guard would rest - to adjust the amount of tension the holster would put on the pistol, and provide retention. Hope this helps.

Joe, this holster will be slightly long for the Model 26 Sir.