I'm afraid that we don't have much information on Marvin storm windows. They tend to have exclusive rights to their hardware and rarely allow us to supply replacement parts. If you can show me a picture of the part in question then I will do my best to find something that matches. Otherwise, I would recommend contacting Marvin directly for assistance.
Hmm, I see. I've run across this once or twice before. As I feared, this isn't something we'll be able to supply. However we do have the 91-179, which is similar in design and function. Do you think perhaps you could get this to work in your storm window? Look over our dimensions and let me know what you think.
Yes, we still sell the 91-179. Shipping cost will depend on what delivery option you select during checkout, as we offer a few different kinds. It will be calculated for you during that process, before the order is finalized.