So I've learned that when you order, you should submit a question to the supplier first and they'll send an extra when the product ships. But it's just not worth it for them to pay for shipping on just a flange...oops. So If you're like me and didn't do this then best thing to do is buy these puppies:

https://www.amazon.com/dp/B08J2BX5HK/ref=cm_sw_r_cp_apa_glt_fabc_ZXZWNZXD0BWFZR9VYR9E