The rare period accessories they mention, one of which would be the little spare fuel canister that mounts right behind the left rear shock. It's the cutest thing. I have the bracket, but not the canister. Made of steel so they rust, and lots of 'em did. Can still be bought new for about 400 quid, and used ones that still look like they won't leak yet (!) are anywhere between $200 and that. In the US, so plus intl postage.
I think I'll get a 3 liter 35 quid plastic rotopax knockoff from Aliexpress instead, thanks.
Then again, new (repro) rear shocks are 50 quid for the pair, so there's that. Suspension on this thing is comically bad, rear has NO damping at all, just a spring really, but it doesn't really matter other than every bump I can hear the tyre rubbing. So I'll throw 50 quid at it sometime for a pair of shiny Chinese shocks I think...