I am new to this forum and I just finished designing my first parts for the EGT. I have custom rear diffuser fins and end plates available in carbon fiber. Each kit comes with everything you need to install with no issues. The images below show the diffuser and end plates in plastic, as it was a prototype. However, the final version will be cut from lightweight carbon fiber. I designed everything from the ground up so if you have any questions, feel free to reach out.
Pricing is as follows:
Diffuser fins only (including hardware): $120
End Plates only (including hardware): $100
Both end plates and fins (including hardware): $200