This is the reply that I got from Treebone when asked about the 76 SGB stock.
"Mike, I have a nice pattern for a 76 shotgun butt, and I am confident it will work on an italian.
price depends on grade of wood, starting at 120. in good standard walnut."
Just an update; Treebone considers their stocks as a 90% fit, so it will take a little bit of work to fit it up. They do have a Uberti 76 stock in house and when compared to the original, they say the two are very close.