Well, you are certainly adventurous to remove the stock. A search of the archives will provide instructions for proper reassembly. 26.5" almost certainly indicates shortened barrels. There has been some discussion about the availability of 28" barrels in that time period, but most LC Smith's of that span had either 30" or 32" barrels. Perhaps our records keeper can tell you if information exists for that serial number. I think most of the records on guns in the 22,000 serial number range have been lost.