99-00 Civic Si OEM Rear Lip, its super rare to come by as it has been discontinued and was an optional item, so not many out there.

The other day I found one for $260.00 (a steal of a price) and my buddy in Colorado picked it up (+ Shipping). I had one a few months ago and sold it along with the OEM 99-00 Si Front Lip for $500.00 ... Just letting you know ahead of time that I hope you have the funds to back up the parts you're demanding.

If you do, then I can keep a look out for you on other sites and if you dont mind paying via PayPal to those sellers and having parts shipped, I can send you links.

PS. Weaksauce.org has BYS Replica Front Bumpers that have excellent fitment for half the price of the Authentic BYS Bumpers, just a suggestion.