@DaveAnna, if you can post a photo of your light, that would help others in identifying what you need. However, take a look at the below discussion thread. If it depicts the same light fixture, then see page 2 for the manufacturer info:
ITC makes the porch light. They do not sell the gasket or lens separately. The gasket is made of natural rubber so it will deteriorate quickly. I made my own out of EPDM synthetic rubber which is more resistant to sun damage. You can purchase different gasket material at Grainger. Some have been successful applying different sealers to the gasket in order to prevent the black streaking issue.
I left a message for princess rv in round rock. It’s just the housing around the light but I’m sure I’ll be buying the whole fixture. It’s the same one pictured in all the above posts. Thanks for everyone’s input!!
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Black dripping Porch light gasket? (vanillacommunity.com)
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Greg & Marlene (Tucson, AZ)
2020 V6 Chevy Colorado