No. The other plastic or vinyl is probably brittle from the UV. As far as the aluminum piece, that really doesn't add that much more to the price.
I don’t know the answer to your question, however you can order one of each or two of one color so they do match. Whatever you don’t use, Home Depot should accept returns.
This item has a decorative trim piece that is the perimeter of what the picture shows. You can screw behind that, but it comes with about 10-12” of piping you can attach to the existing duct. Bayou can remove this piece of pipe and attach to the existing pipe in your home as well. Find me on YouTube David T and let me know if you’d like me to make a video on this and I will try to do that for you
Thank you for your interest in Builders Edge. This vent is 7" wide by 8" tall, it comes on a nailing flange and should be installed under the siding.
Thank you for your interest in Builders Edge. Please contact customer service at 1-800-969-7245 and we can help you with this.