I have a Strafe Design rear diffuser for sale. Still in box with hardware... never been installed. Strafe said it will fit a MK7.5 R as well
$120 + shipping
https://www.strafedesign.com/collections/volkswagen/products/vw-mk7-gti-v4-rear-diffuser
Had it for a few months, looking to upgrade soon. It has the Bluetooth module, positap and the additional aluminum casing. Great condition
Looking for $420
Location- 30078