According to this: http://www.choke-tube.com/choke_chart.asp the "old" chokes are the same as Win-choke, which is the same as Mossberg Accu-choke and Browning Invector. It also says the "new" longer chokes are Ruger's alone.
So which do you have? If you're chokes are only 1.5" long, they are Win-choke and you can get them just about anywhere. If they are Ruger's proprietary choke, not so much. Maybe go to Google and type in "Ruger choke tube" and see who might have them.
Improved cylinder and modified would be a very versatile choke combination.
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