Diaundra Toilet Seat with soft close lid

Do not buy - does not fit securely. Listing is incorrect - plastic hardware is supplied and the plastic nuts slip on the plastic bolt, preventing it from being done up tight enough not to slip on the toilet. Listing is also incorrect about it being soft close - it is not soft close.

Looks like I ordered extra toilet seat as first one hadn't arrived.sortu for that. But now two arrived together. However both are wrong shape .like colour but elongated shape no good for my older round shape.- only opened one. Please Advise on sending both back