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I've done that before with prescriptions lenses, with vintage frames and with new frames over the years. Just take them to the shop and tell them what you need. I don't think there's a brand to look for in this space. A good shop working with the right suppliers should be fine. You will be able to specify the color and darkness of the tint. I'm sure there are several online providers as well. Actually, just googled "sunglass lenses online" and got a ton of hits.