Though I've had another idea that would be much easier...… 
Make your piece as originally designed, 8mm maybe, but drill 6 holes - 3 each on opposite sides. 2 identical pieces for 1 joint.
Then make 2 cuts to create the piece shaped like mine and retain the cutout segments which will have one hole in each.
Fit the main pieces over the pipes from opposite sides, insert the 4 corner bolts and tighten enough to hold in place.
Then slide in the two sections previously cut out and fit 2 further bolts to make a complete fitment. Tighten.
The repair pieces might need to be slightly larger or a subtly different shape to accommodate the extra bolts. More Hexagonal maybe, like the attached sketch?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 20th February 2020 at 09:36 AM.
Reason: Add diagram.
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