I have an unused, unpainted Havoc rear diffuser for sale. It is a 2 piece diffuser. I bought it for my SS but sold the car awhile ago.
https://www.carid.com/ivs/havoc-rear...BoCOnsQAvD_BwE
$500 for local pickup. Located in Northern Indiana and willing to drive to meet
I would prefer not to ship as it is a large piece but if need be I can do that. Will post pics in a few mins