The armrest for the Audi TT MK I is available in three variations. Dual joints (twinarm), single joint (singlearm) with cupholder and singlearm without cupholder.
Please let us know if you are using a factory-provided hands free kit.
You will need the cover if you have a factory-provided cup holder installed in your audi. You will have to remove the cupholder before assembling the armrest. The cover will cover the hole of the fixation.