Donels wrote:It was to minimise unsprung weight.
Mystery solved. When I pulled one out to flip it over, I found the bushing on one end 2mm shorter than the other. So, I suspect at some point in the past the shock bushes were replaced but put on the wrong ends, and instead of re-doing they were mounted inverted (the longer bushing won't fit in the lower a-arm).
I think I can see from a 2008 picture I have they've been inverted for quite a while. Since my initial goal has been to make the suspension and brakes safe enough to drive it (carefully) to get a sense of what else it needs, and suspecting I'll need to have the dampers rebuilt or replaced in the near future, I'm reinstalling inverted for the time being.