Thanks, had to have the pole on a seat since I have a tow post in the back. the two double jockies are detachable. I attach pictures of the teo other seat configuration possibilities.
Contact Solent welding at Fareham - show them the above photos and they'll be able to make one up for you. They've done lots of stuff for me over the last couple of years, very helpful chaps.
I fitted railblaza nav lights from my console which are easy to put on or take off when not in uses with the easy locking fittings. https://www.railblaza.com/products/navipack/