See the link for our Pick-A-Kit helper at the top of this forum. At the bottom of that page is a chart that explains how to tell the difference between metals.
Parts that have been anodized will not conduct electricity. Die cast parts will react to acid. Place a drop in an inconspicuous area and see if it fizzes.
If you need to re-anodize anything, it will need to be stripped.
If you want your old aluminum part to look good anodized, you will have to polish it to a high shine first. The condition of the part before anodizing dictates the look of the finished product.
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