My local nut and bolt supplier (it's like Screwfix/ToolStation, so a small shop on an industrial estate rather than a huge warehouse like B&Q) has a huge range of nuts and bolts and other fixings. Bright steel high tensile M10 x 75mm long bolts for 18p each, bright steel high tensile M10 nylock nuts for 4p. You measure bolts from the bottom of the head to the end of the thread, not the whole length of the bolt. Of course, they have a huge range of lengths often in 5mm increments in the shorter lengths.I came across the same fully threaded rear bottom absorber bolt on mine. I agree it did not seem right for the shock to rest on a thread.
The fun starts trying to buy two, seem expensive and not many sources, one eBay seller wants £15 each!, Audi or TPS will probably be a better bet. If you google the part number some sellers quote the fully threaded bolt as an alternative, no doubt cheaper which is why it has been used.
The manual specifies replace both nut and bolt, personally I would reuse the correct bolt (after all the working force is perpendicular), but I would replace the single use self-locking nut.
Andy
However, I tend to reuse most nuts and bolts. As long as I don't feel the bolt will fail through fatigue I tend to use it again.
If you live near a big town, google "TOWN NAME nuts and bolts". My local supplier was shown on the first page of the google search. However, it is what you might call an industrial town. If your local town doesn't have a lot of industry then you might not find such a good builder's merchant/tool supplier with a huge range of nuts and bolts at low prices.
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