Not many people would carry that gun IWB. You would be better served by a 3 slot pancake holster. When you buy a holster for a revolver you can simply go by barrel length. Personally, in TX I would try to find a snubbie you can pocket carry. I have a 70's model charter that works real well for summer carry. If you buy a charter find and old one, they don't make em like they used to.
I plan on buying a different piece but just moved here two weeks ago
and towed my boat behind moving truck so the next pruchase will be another truck. Have one in mind and should be doing that in a week or so
and then will look into something a bit easier to conceal
from the picture, it looks like a 3". Measuring from the barrel tip to the wheel is close enough. There is that space between the two parts. Im not sure what thats called, but I think thats part of the frame. You should be able to round toward the most accurate length for your holster.