Parts List:
- 2 Rear Shoulder 3 point belts: LA Auto Dismantlers
- Alternate source - PEP. These guys vanished, then reappeared since with a new site: Professionally Engineered Products - PEP
- 4 Seat Belt Guide - OEM 911-555-615-01 and available at Pelican Parts
- 8 Seat Belt Screws - OEM 911-555-615-01 and available at Pelican Parts
- 1 Shroth Harness Kit - SR01324, used to install Shroth aftermarked auto harnesses
Tools:
- Tape measures and rulers (measure twice cut once!!)
- Philips Head Screwdriver
- 17 MM Socket Set
- XActo Pen Knife
- XActo wood working kit - flat blade bit mounted to handle
- Power drill, 1/16" and 1/4" bits, Philips head driver
- Coping Saw
- Small shop vacuum
- Hand files - flat and round
Materials:
- Cardboard for a template, large piece.
- Pen
Procedures
Mounting the 3 Point Shoulder Seatbelts
- Remove rear deck by removing the 4 Philips head screws holding the deck in place.
- Find perforated deck padding in the shape of the intertial reels.
- Remove perforated area to reveal hardened steel threaded bolt holes.
- Remove outboard 17mm seat belt bolts. Careful as the heads for these bolts are very shallow.
- Lineup and prepare to bolt in the hardware.
You may need to cut away excess padding, the templates are not perfect especially after 20 years of waiting for belts!!
- Bolt in the hardware to check that its all there and it works. Don't overtighten, as you will need to remove the belt to push it through the belt guide holes you cut below!
Early Work Adding a LATCH top tether to my 911
In addition to shoulder belts, having solid mounting points for baby seats is a really nice addition to the project. Some images inspired by recent efforts on the Pelican Parts Tech Forums
- Rear Seat Top Tether Parts
- Close Up, Rear Seat Top Tether
- Britax Roundabout Testing the Rear Seat Top Tether
- Britax Roundabout - Bad Fitment?
After way too much thought, I went about a web search looking for seatbelt and harness hardware.
Here was the solution, a kit used to configure Shroth aftermarket harnesses. a kit "SR01324" used to install Shroth aftermarked auto harnesses The adapter is indended for belt OR for clip in belt connector use.
Cutting Holes and Installing Belt Guides In A 911's Rear Deck
Once the parts were finally collected the together and the new Shroth mounts looked like a go, I got to work very rapidly.
Building a Template for the Rear DeckThe first critical step to doing this right was to build a cardboard template of the rear deck. In this process, I learned that I actually needed the standard Porsche belt guide as opposed to any funky periscope trims, and that the mounting surface would be relatively flat despite the curves of the deck.
- Remove Deck from Car.
- Trace the lower part of the deck onto a large piece of cardboard.
- TRACE the 4 screw holes
- Cut out the tracing.
- Mount the cut cardboard template to the ORIGINAL deck to check for final sizing.
- And the final step, MOUNT the TEMPLATE in the CAR using the original 4 bolts that hold the deck. Of all the pictures I took, I failed to take one of this setup. I ended up driving around for 2 weeks with my cardboard deck as I waited for my parts and time to proceed further, freaking out the 911 fans at my office when they saw it!

Conclusion
So it works well and looks pretty good. I am
ready to add extra mounts for more LATCH connectors at the rear seat
belt mount point. I am also looking for "the ultimate" rear booster
seat for a 911 - narrow in the back and very shallow - suggestions please.
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References