Like a lot of 35 year old parts, especially plastic and rubber, these parts are hard to find in good condition. If your parts are in really nice condition, please sell them to someone who needs them. If you want black parts, purchase them. If you want to paint some other color find some less stellar examples. That tends to help everyone. Of course, you are entitled to do your own thing.
This piece of advice is brought to you by the committee to preserve as much as much unobtanium as possible.