I'm afraid that I'm not familiar with the given codes. We may still be able to help, but we'll need more information.
Photos would be the best place to start. We'll need to check the style of your original to match it up to potential replacement options in our catalog. You'll also need to measure the original window operator's installation hole centers and link arm so that we can narrow the options down even further.
Please let us know if you can provide that data and we can work from there!
I'd be more than happy to help you look for this, but can you submit a few photos of your hardware so we can review what you have? That would be a huge help!
This picture is a big help, thanks! I wasn't able to find an identical match to your original part, but it appears that our 39-058 Window Lock is the closest operator we have at this time. Look it over and let me know if you agree, or if you had any questions.
EDIT: A helpful customer has since informed us that our 39-278 can replace the old 11500-4. This remains our top suggestion.
Thanks for posting, Bernie! As Dave mentioned above, our 39-058 operator is the closest match to the old 11500-4 that we've been able to find, however we've not yet received confirmation that it works. I recommend starting here and seeing what you think.
EDIT: A helpful customer has since informed us that our 39-278 can replace the old 11500-4. This remains our top suggestion.
That's great news! Thanks for letting us know, Jeff. I'm sure this information will help many other customers in the future. I'll amend our previous posts to reflect your research.