Both passenger and driver can reach it, and it doesn't particularly get in the way of any rear passengers (who have to be pretty small, anyway!). It doesn't stop the rear seat tipping up either.
-- Pete "Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
I've finally installed a fire extinguisher in the cab, much better than having one in the boot I think:
I went with a 2l Ajax/ Chubb foam extinguisher mounted under the passenger seat (LHD car) on a bracket made from 40x40x200 aluminium angle pop riveted to the seat frame. I've tested grabbing it from both seats and found no issues. I'll do the same for the 900 and I also installed two new 6l foam extinguishers in the workshop whilst I was at it. I hope I never need any of them.
The seats are indeed in great condition (although I'm jealous of Pete's retrimmed seats!); they came out of a Swedish 96 a friend and I have broken. They had covers on them, probably from new.