Hi DM
The original gaiter failed on the left hand side as viewed from the front of the car (drivers side UK) and it was the thick end of the gaiter. I fitted the replacement with the thick end on the right hand side (passenger side) and this one failed on the right hand side. So it would seem that the gaiter fails on whichever side the thick end in fitted.

The centre section of my version is made from a piece of plastic pipe. It is not a type of pipe used in home plumbing but is designed for swimming pools and ponds. It has a pressure rating of 9 bar and hence has a wall thickness of around 3mm. The piece of pipe has a section removed and replaced with a piece of 1mm thick aluminium, this forms the flat section that is needed to bolt to the rack, see photos. The bellows on each end are obtainable from Car Builder Solutions and have ends that can be trimmed to the required diameters. One end is trimmed to 40 mm I.D. which fits nicely onto the rack and the other end trimmed to 60 mm which fits nicely on the pipe. I could put together a document with some photos and dimension sketches if you are interested in having a go.

Zach

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