Are you vendor of parts, or are you a private seller?
We have a policy that vendors have to register to advertise. We have this policy to help police/protect against scam/sellers. If you are a vendor, and you don't register, we'll have to take down the posts and ask you refrain from further such solicitation-posts, or it will result in a ban.
If you wish to become a vendor, please contact @mclarenadmin and/or myself to guide you through the process.