Not sure how you're supposed to take a picture of a missing part, but maybe this will help.
There are several places that sell parts but they are all subject to shortages, like the rest of us. You can find them on ebay sometimes or you might have better luck just googling it.
You can also find a suitable replacement at <
www.bulletbutton.com>. It's called the Prince 50. I don't have any experience with them but most people here really like them. I have also heard of people using a front sight from a Hi-Point 995, but no experience there either.
Good luck. Let us know what you decide to do.
Gator