Your best bet is to call Kolar and talk to them. I think the numbers refer to different drops at comb and cast. Most guys that I know start with or use the #3.
Sent you a PM.I have been looking at Kolar and keep seeing #2 stock, #4 stock, but I am not sure what that refers to. Is it the grade of wood or shape of the stock? Also, is there a page that shows pictures of the different models, such as premier, premier extra, regal, etc.? I have been all over the website and can't find this.