Credit must first go to forum member snbrdrdan, who suggested this and provided the part numbers. 
His original post is here: http://www.golfmk7.com/forums/showpost.php?p=407502&postcount=15
Yes, you can mount both your OEM spare tire and your Helix Soundbox under your rear floor cover and have it sitting flush and proper in your Mk7 GTI.
You will need two parts: 1T0-803-899-B (long mount bolt) and a duplicate 1K0-803-899-D (regular mount bolt that comes stock with MK7 GTI). You will only need one tool: a 3mm allen/hex key to remove the feet from the Helix box. The longer bolt will replace your existing shorter bolt, and you need to buy a second short one only for the second screw that you will need. The shorter bolt with screw was only ~$3, so I didn't bother trying to locate just the screw. I am listing the vendor (VWPartsVortex dot com) because they were inexpensive and got this to me from New Jersey to Delaware in one day. I have no affiliation with them; they have simply always been very fast with shipping and competitively priced:
Install Steps:
1. Clear everything out of the hatch area.
2. Remove your existing short mount bolt by turning it 90 degrees clockwise or counterclockwise and pulling it straight up out of the key hole. Remove the little foam donut at the base and transfer it to the new longer bolt. Install the long mount bolt in reverse.
3. Pass the Helix wire/connector through one of the spare's wheel holes to avoid pinching between top of tire and bottom of Helix, put the spare tire back in the stock location, and screw it down tight with the first screw.
4. Remove the five little rubber feet/bumpers from the bottom of the Helix box with a 3mm allen/hex key. This is mandatory if you want the floor cover to fit flush over top of the Helix unit. Without removal the removable rear floor cover won't lay flat or click into place:
5. Center the Helix box on top of the tire and install the second big plastic screw that came with the duplicate short bolt you purchased. If you are concerned about any possible marring of the Helix subwoofer speaker grilles, you could place some sort of protective layer between the Helix box and the tire, but I was not concerned about it and did not:
6. Enjoy better sound while keeping your spare.
PS. Here are the dongle codes too:
His original post is here: http://www.golfmk7.com/forums/showpost.php?p=407502&postcount=15Yes, you can mount both your OEM spare tire and your Helix Soundbox under your rear floor cover and have it sitting flush and proper in your Mk7 GTI.
You will need two parts: 1T0-803-899-B (long mount bolt) and a duplicate 1K0-803-899-D (regular mount bolt that comes stock with MK7 GTI). You will only need one tool: a 3mm allen/hex key to remove the feet from the Helix box. The longer bolt will replace your existing shorter bolt, and you need to buy a second short one only for the second screw that you will need. The shorter bolt with screw was only ~$3, so I didn't bother trying to locate just the screw. I am listing the vendor (VWPartsVortex dot com) because they were inexpensive and got this to me from New Jersey to Delaware in one day. I have no affiliation with them; they have simply always been very fast with shipping and competitively priced:
Install Steps:
1. Clear everything out of the hatch area.
2. Remove your existing short mount bolt by turning it 90 degrees clockwise or counterclockwise and pulling it straight up out of the key hole. Remove the little foam donut at the base and transfer it to the new longer bolt. Install the long mount bolt in reverse.
3. Pass the Helix wire/connector through one of the spare's wheel holes to avoid pinching between top of tire and bottom of Helix, put the spare tire back in the stock location, and screw it down tight with the first screw.
4. Remove the five little rubber feet/bumpers from the bottom of the Helix box with a 3mm allen/hex key. This is mandatory if you want the floor cover to fit flush over top of the Helix unit. Without removal the removable rear floor cover won't lay flat or click into place:
5. Center the Helix box on top of the tire and install the second big plastic screw that came with the duplicate short bolt you purchased. If you are concerned about any possible marring of the Helix subwoofer speaker grilles, you could place some sort of protective layer between the Helix box and the tire, but I was not concerned about it and did not:
6. Enjoy better sound while keeping your spare.
PS. Here are the dongle codes too:
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