If you double click on the model number you can see the specifics of the barrel. The cantilever barrels should show a folding rear sight.
For example, if yours is the 3" model, the 611123253 barrel might the one you want or with the 3.5" you may want the 611053253, depending upon the finish that you need to match.
Once you have the part number, just to be certain that you have the correct one, you should be able to speak to CS at Winchester and verify that you have the correct one for your gun.
If you can't get them to give you an answer, you may want to call John Mann @ Mann & Son Sporting Goods (Since 1946) 618.357.2911 and ask him to look that barrel up for you to make sure you're getting the correct one. He's a full line Winchester/Browning dealer and can also get that barrel for you, probably at a better price than listed.
Thanks,
Clark